A.2.1.4 PDU parameters

24.2293GPPIP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP)Release 18Stage 3TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

A.2.1.4.1 Status-codes

Table A.6: Supported status-codes

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	100 (Trying)	[26] 21.1.1	c21	c21	[26] 21.1.1	c11	c11
101	1xx response	[26] 21.1	p21	p21	[26] 21.1	p21	p21
101A	18x response	[26] 21.1	p21	p21	[26] 21.1	p21	p21
2	180 (Ringing)	[26] 21.1.2	c2	c2	[26] 21.1.2	c1	c1
3	181 (Call Is Being Forwarded)	[26] 21.1.3	c2	c2	[26] 21.1.3	c1	c1
4	182 (Queued)	[26] 21.1.4	c2	c2	[26] 21.1.4	c1	c1
5	183 (Session Progress)	[26] 21.1.5	c34	c34	[26] 21.1.5	c1	c1
5A	199 (Early Dialog Terminated)	[142] 11.1	c32	c32	[142] 11.1	c32	c32
102	2xx response	[26] 21.2	p22	p22	[26] 21.1	p22	p22
6	200 (OK)	[26] 21.2.1	m	m	[26] 21.2.1	m	m
7	202 (Accepted)	[28] 8.3.1	c36	c36	[28] 8.3.1	c37	c37
103	3xx response	[26] 21.3	p23	p23	[26] 21.1	p23	p23
8	300 (Multiple Choices)	[26] 21.3.1	m	m	[26] 21.3.1	m	m
9	301 (Moved Permanently)	[26] 21.3.2	m	m	[26] 21.3.2	m	m
10	302 (Moved Temporarily)	[26] 21.3.3	m	m	[26] 21.3.3	m	m
11	305 (Use Proxy)	[26] 21.3.4	m	m	[26] 21.3.4	m	m
12	380 (Alternative Service)	[26] 21.3.5	m	m	[26] 21.3.5	m	m
104	4xx response	[26] 21.4	p24	p24	[26] 21.4	p24	p24
13	400 (Bad Request)	[26] 21.4.1	m	m	[26] 21.4.1	m	m
14	401 (Unauthorized)	[26] 21.4.2	o	c12	[26] 21.4.2	m	m
15	402 (Payment Required)	[26] 21.4.3	n/a	n/a	[26] 21.4.3	n/a	n/a
16	403 (Forbidden)	[26] 21.4.4	m	m	[26] 21.4.4	m	m
17	404 (Not Found)	[26] 21.4.5	m	m	[26] 21.4.5	m	m
18	405 (Method Not Allowed)	[26] 21.4.6	m	m	[26] 21.4.6	m	m
19	406 (Not Acceptable)	[26] 21.4.7	m	m	[26] 21.4.7	m	m
20	407 (Proxy Authentication Required)	[26] 21.4.8	o	o	[26] 21.4.8	m	m
21	408 (Request Timeout)	[26] 21.4.9	c2	c2	[26] 21.4.9	m	m
22	410 (Gone)	[26] 21.4.10	m	m	[26] 21.4.10	m	m
22A	412 (Conditional Request Failed)	[70] 11.2.1	c20	c20	[70] 11.2.1	c20	c20
23	413 (Request Entity Too Large)	[26] 21.4.11	m	m	[26] 21.4.11	m	m
24	414 (Request-URI Too Large)	[26] 21.4.12	m	m	[26] 21.4.12	m	m
25	415 (Unsupported Media Type)	[26] 21.4.13	m	m	[26] 21.4.13	m	m
26	416 (Unsupported URI Scheme)	[26] 21.4.14	m	m	[26] 21.4.14	m	m
26A	417 (Unknown Resource Priority)	[116] 4.6.2	c24	c24	[116] 4.6.2	c24	c24
27	420 (Bad Extension)	[26] 21.4.15	m	c13	[26] 21.4.15	m	m
28	421 (Extension Required)	[26] 21.4.16	o	o	[26] 21.4.16	i	i
28A	422 (Session Interval Too Small)	[58] 6	c7	c7	[58] 6	c7	c7
29	423 (Interval Too Brief)	[26] 21.4.17	c4	c4	[26] 21.4.17	m	m
29A	424 (Bad Location Information)	[89] 4.2	c23	c23	[89] 4.2	c23	c23
29AA	428 Use Identity Header	[252] 6.2.2	c40	c40	[252] 6.2.2	c40	c40
29B	429 (Provide Referrer Identity)	[59] 5	c8	c8	[59] 5	c9	c9
29C	430 (Flow Failed)	[92] 11	n/a	n/a	[92] 11	c22	c22
29D	433 (Anonymity Disallowed)	[67] 4	c14	c14	[67] 4	c14	c14
29DA	436 Bad Identity Info	[252] 6.2.2	c40	c40	[252] 6.2.2	c40	c40
29DB	437 Unsupported Credential	[252] 6.2.2	c40	c40	[252] 6.2.2	c40	c40
29DC	438 Invalid Identity Header	[252] 6.2.2	c40	c40	[252] 6.2.2	c40	c40
29E	439 (First Hop Lacks Outbound Support)	[92] 11	c28	c28	[92] 11	c29	c29
29F	440 (Max Breadth Exceeded)	[117] 5	n/a	c30	[117] 5	c31	c31
29G	469 (Bad INFO Package)	[25] 4.2	c33	c33	[25] 4.2	c33	c33
29H	470 (Consent Needed)	[125] 5.9.2	c26	c26	[125] 5.9.2	c27	c27
30	480 (Temporarily Unavailable)	[26] 21.4.18	m	m	[26] 21.4.18	m	m
31	481 (Call/Transaction Does Not Exist)	[26] 21.4.19	m	m	[26] 21.4.19	m	m
32	482 (Loop Detected)	[26] 21.4.20	m	m	[26] 21.4.20	m	m
33	483 (Too Many Hops)	[26] 21.4.21	m	m	[26] 21.4.21	m	m
34	484 (Address Incomplete)	[26] 21.4.22	o	o	[26] 21.4.22	m	m
35	485 (Ambiguous)	[26] 21.4.23	o	o	[26] 21.4.23	m	m
36	486 (Busy Here)	[26] 21.4.24	m	m	[26] 21.4.24	m	m
37	487 (Request Terminated)	[26] 21.4.25	m	m	[26] 21.4.25	m	m
38	488 (Not Acceptable Here)	[26] 21.4.26	m	m	[26] 21.4.26	m	m
39	489 (Bad Event)	[28] 8.3.2	c3	c3	[28] 8.3.2	c3	c3
40	491 (Request Pending)	[26] 21.4.27	m	m	[26] 21.4.27	m	m
41	493 (Undecipherable)	[26] 21.4.28	m	m	[26] 21.4.28	m	m
41A	494 (Security Agreement Required)	[48] 2	c5	c5	[48] 2	c6	c6
105	5xx response	[26] 21.5	p25	p25	[26] 21.5	p25	p25
42	500 (Internal Server Error)	[26] 21.5.1	m	m	[26] 21.5.1	m	m
43	501 (Not Implemented)	[26] 21.5.2	m	m	[26] 21.5.2	m	m
44	502 (Bad Gateway)	[26] 21.5.3	o	o	[26] 21.5.3	m	m
45	503 (Service Unavailable)	[26] 21.5.4	m	m	[26] 21.5.4	m	m
46	504 (Server Time-out)	[26] 21.5.5	m	m	[26] 21.5.5	m	m
47	505 (Version not supported)	[26] 21.5.6	m	m	[26] 21.5.6	m	m
48	513 (Message Too Large)	[26] 21.5.7	m	m	[26] 21.5.7	m	m
49	580 (Precondition Failure)	[30] 8	c35	c35	[30] 8	c35	c35
106	6xx response	[26] 21.6	p26	p26	[26] 21.6	p26	p26
50	600 (Busy Everywhere)	[26] 21.6.1	m	m	[26] 21.6.1	m	m
51	603 (Decline)	[26] 21.6.2	c10	c10	[26] 21.6.2	m	m
52	604 (Does Not Exist Anywhere)	[26] 21.6.3	m	m	[26] 21.6.3	m	m
53	606 (Not Acceptable)	[26] 21.6.4	m	m	[26] 21.6.4	m	m
54	607 (Unwanted)	[254]	o	c38	[254]	o	c39
c1: IF A.5/9 THEN m ELSE n/a – – INVITE response. c2: IF A.5/9 THEN o ELSE n/a – – INVITE response. c3: IF A.4/20 THEN m ELSE n/a – – SIP specific event notification extension. c4: IF A.5/19 OR A.5/21 THEN m ELSE n/a – – REGISTER response or SUBSCRIBE response. c5: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol. c6: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol. c7: IF A.4/42 AND (A.5/9 OR A.5/23) THEN m ELSE n/a – – the SIP session timer AND (INVITE response OR UPDATE response). c8: IF A.4/43 AND A.5/17 THEN o ELSE n/a – – the SIP Referred-By mechanism and REFER response. c9: IF A.4/43 AND A.5/17 THEN m ELSE n/a – – the SIP Referred-By mechanism and REFER response. c10: IF A.4/44 THEN m ELSE o – – the Session Inititation Protocol (SIP) "Replaces" header. c11: IF A.5/3 OR A.5/9 OR A.5/9B OR A.5/11OR A.5/13 OR A.5/15 OR A.5/15B OR A.5/17 OR A.5/19 OR A.5/21 OR A.5/23 THEN m ELSE n/a – – BYE response or INVITE response or MESSAGE response or NOTIFY response or OPTIONS response or PRACK response or PUBLISH response or REFER response or REGISTER response or SUBSCRIBE response or UPDATE response. c12: IF A.3/4 THEN m ELSE o – – S-CSCF. c13: IF A.3/1 OR A.3/2 OR A.3/4 THEN m ELSE o – – UE, P-CSCF, S-CSCF. c14: IF A.4/48 THEN m ELSE n/a – – rejecting anonymous requests in the session initiation protocol. c20: IF A.4/41 THEN m ELSE n/a – – an event state publication extension to the session initiation protocol. c21: IF A.5/3 OR A.5/9 OR A.5/9B OR A.5/11 or A.5/13 OR A.5/15 OR A.5/15B OR A.5/17 OR A.5/19 OR A.5/21 OR A.5/23 THEN o ELSE n/a – – BYE response or INVITE response or MESSAGE response or NOTIFY response or OPTIONS response or PRACK response or PUBLISH response or REFER response or REGISTER response or SUBSCRIBE response or UPDATE response. c22: IF A.4/57 THEN m ELSE n/a – – managing client initiated connections in SIP. c23: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c24: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol. c26: IF A.4/75B THEN m ELSE n/a – – a recipient within the framework for consent-based communications in SIP. c27: IF A.4/75A THEN m ELSE n/a – – a relay within the framework for consent-based communications in SIP. c28: IF A.4/2 AND A.4/57 THEN m ELSE n/a – – registrar, managing client initiated connections in SIP. c29: IF A.4/1 AND A.4/57 THEN m ELSE n/a – – client behaviour for registration, managing client initiated connections in SIP. c30: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling). c31: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c32: IF A.5/9 AND A.4/81 THEN m ELSE n/a – – INVITE response and 199 (Early Dialog Terminated) response. c33: IF A.4/13 THEN m ELSE n/a – – SIP INFO method and package framework. c34: IF A.4/16 OR A.3/6 THEN m ELSE IF A.5/9 THEN o ELSE n/a – – initiating a session which require local and/or remote resource reservation, MGCF, INVITE response. c35: IF A.4/16 THEN m ELSE n/a – – integration of resource management and SIP. c36: IF A.5/9B THEN m ELSE n/a – – MESSAGE response. c37: IF A.4/20 OR OR A.5/9B OR A.5/17 THEN m ELSE n/a – – SIP specific event notification extension or MESSAGE response or the REFER response. c.38: IF A.4/117 THEN o ELSE n/a – – a SIP response code for unwanted calls extension. c.39: IF A.4/117 THEN m ELSE n/a – – a SIP response code for unwanted calls extension. c.40 IF A.4/116 THEN m ELSE n/a – authenticated identity management in the Session Initiation Protocol p21: A.6/2 OR A.6/3 OR A.6/4 OR A.6/5 OR A.6/5A – – 1xx response. p22: A.6/6 OR A.6/7 – – 2xx response. p23: A.6/8 OR A.6/9 OR A.6/10 OR A.6/11 OR A.6/12 – – 3xx response. p24: A.6/13 OR A.6/14 OR A.6/15 OR A.6/16 OR A.6/17 OR A.6/18 OR A.6/19 OR A.6/20 OR A.6/21 OR A.6/22 OR A.6/22A OR A.6/23 OR A.6/24 OR A.6/25 OR A.6/26 OR A.6/26A OR A.6/27 OR A.6/28 OR A.6/28A OR A.6/29 OR A.6/29A OR A.6/29B OR A.6/29C OR A.6/29D OR A.6/29E OR A.6/29F OR A.6/29G OR A.6/29H OR A.6/30 OR A.6/31 OR A.6/32 OR A.6/33 OR A.6/34 OR A.6/35 OR A.6/36 OR A.6/436 OR A.6/38 OR A.6/39 OR A.6/40 OR A.6/41 OR A.6/41A. – 4xx response. p25: A.6/42 OR A.6/43 OR A.6/44 OR A.6/45 OR A.6/46 OR A.6/47 OR A.6/48 OR A.6/49 – – 5xx response p26: A.6/50 OR A.6/51 OR A.6/52 OR A.6/53 – – 6xx response.

A.2.1.4.2 ACK method

Prerequisite A.5/1 – ACK request

Table A.7: Supported header fields within the ACK request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Contact	[56B] 9.2	c9	c9	[56B] 9.2	c10	c10
2	Allow-Events	[28] 8.2.2	c1	c1	[28] 8.2.2	c2	c2
3	Authorization	[26] 20.7	c3	c3	[26] 20.7	c3	c3
4	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
5	Cellular-Network-Info	7.2.15	n/a	c26	7.2.15	n/a	c27
6	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
7	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
7A	Content-ID	[256] 3.2	o	c29	[256] 3.2	m	c30
8	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
9	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
10	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
11	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
12	Date	[26] 20.17	c4	c4	[26] 20.17	m	m
13	From	[26] 20.20	m	m	[26] 20.20	m	m
13A	Max-Breadth	[117] 5.8	n/a	c14	[117] 5.8	c15	c15
14	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c16
15	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
15A	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c19	c20	[52] 4.4, [52A] 4, [234] 2	c19	c21
15C	Privacy	[33] 4.2	c6	n/a	[33] 4.2	c6	n/a
15D	P-Charging-Vector	[52] 4.6, [52A] 4	c22	c23	[52] 4.6, [52A] 4	c22	c23
15E	Priority-Share	Subclause 7.2.16	n/a	c28	Subclause 7.2.16	n/a	c28
16	Proxy-Authorization	[26] 20.28	c5	c5	[26] 20.28	n/a	n/a
17	Proxy-Require	[26] 20.29	o	n/a	[26] 20.29	n/a	n/a
17A	Reason	[34A] 2	c8	c8	[34A] 2	c8	c8
17B	Record-Route	[26] 20.30	n/a	c16	[26] 20.30	n/a	c16
17C	Recv-Info	[25] 5.2.3	c17	c17	[25] 5.2.3	c17	c17
17D	Reject-Contact	[56B] 9.2	c9	c9	[56B] 9.2	c10	c10
17E	Relayed-Charge	7.2.12	n/a	c24	7.2.12	n/a	c24
17F	Request-Disposition	[56B] 9.1	c9	c9	[56B] 9.1	c10	c10
18	Require	[26] 20.32	n/a	n/a	[26] 20.32	n/a	n/a
18A	Resource-Priority	[116] 3.1	c11	c11	[116] 3.1	c11	c11
18B	Resource-Share	Subclause 7.2.13	n/a	c25	Subclause 7.2.13	n/a	c25
19	Route	[26] 20.34	m	m	[26] 20.34	n/a	c16
19A	Session-ID	[162]	o	c18	[162]	o	c18
20	Timestamp	[26] 20.38	c7	c7	[26] 20.38	m	m
21	To	[26] 20.39	m	m	[26] 20.39	m	m
22	User-Agent	[26] 20.41	o	o	[26] 20.41	m	m
23	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c2: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c3: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c4: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c5: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c6: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c7: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c8: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c9: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c10: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c11: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol. c14: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling). c15: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c16: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c17: IF A.4/13 THEN m ELSE IF A.4/13A THEN m ELSE n/a – – SIP INFO method and package framework, legacy INFO usage. c18: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c19: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c20: IF A.4/34 AND A.3/1 OR A.3/2A OR A.3/7 OR A.3A/81 OR A.3A/81A OR A.3A/81B THEN o ELSE n/a – – the P-Access-Network-Info header extension and UE, P-CSCF (IMS-ALG), AS, MSC Server enhanced for ICS, MSC server enhanced for SRVCC using SIP interface, MSC server enhanced for DRVCC using SIP interface. c21: IF A.4/34 AND A.3/1 OR A.3/7 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE, AS. c22: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c23: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c24: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c25: IF A.4/112 THEN o ELSE n/a – – resource sharing. c26: IF A.4/113 AND A.3/1 OR A.3/2A OR A.3/7 THEN o ELSE n/a – – the Cellular-Network-Info header extension and UE, P-CSCF (IMS-ALG), AS. c27: IF A.4/113 AND A.3/7 THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS. c28: IF A.4/114 THEN o ELSE n/a – – priority sharing. c29: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c30: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).

Prerequisite A.5/1 – ACK request

Table A.8: Supported message bodies within the ACK request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

A.2.1.4.3 BYE method

Prerequisite A.5/2 – – BYE request

Table A.9: Supported header fields within the BYE request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o	o	[26] 20.1	m	m
1A	Accept-Contact	[56B] 9.2	c18	c18	[56B] 9.2	c22	c22
2	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
3A	Allow	[26] 20.5	o	o	[26] 20.5	m	m
4	Allow-Events	[28] 8.2.2	c1	c1	[28] 8.2.2	c2	c2
5	Authorization	[26] 20.7	c3	c3	[26] 20.7	c3	c3
6	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
6A	Cellular-Network-Info	7.2.15	n/a	c35	7.2.15	n/a	c36
7	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
8	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
8A	Content-ID	[256] 3.2	o	c37	[256] 3.2	m	c38
9	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
10	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
11	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
12	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
13	Date	[26] 20.17	c4	c4	[26] 20.17	m	m
14	From	[26] 20.20	m	m	[26] 20.20	m	m
14A	Geolocation	[89] 4.1	c23	c23	[89] 4.1	c23	c23
14B	Geolocation-Routing	[89] 4.2	c23	c23	[89] 4.2	c23	c23
14C	Max-Breadth	[117] 5.8	n/a	c29	[117] 5.8	c30	c30
15	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c31
16	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
16A	P-Access-Network-Info	[52] 4.4, [234] 2	c9	c10	[52] 4.4, [234] 2	c9	c11
16B	P-Asserted-Identity	[34] 9.1	n/a	n/a	[34] 9.1	c6	c6
16C	P-Charging-Function-Addresses	[52] 4.5	c13	c14	[52] 4.5	c13	c14
16D	P-Charging-Vector	[52] 4.6	c12	c34	[52] 4.6	c12	c34
16F	P-Preferred-Identity	[34] 9.2	c6	x	[34] 9.2	n/a	n/a
16G	Privacy	[33] 4.2	c7	n/a	[33] 4.2	c7	c7
17	Proxy-Authorization	[26] 20.28	c5	c5	[26] 20.28	n/a	n/a
18	Proxy-Require	[26] 20.29	o	n/a	[26] 20.29	n/a	n/a
18A	Reason	[34A] 2	c17	c21	[34A] 2	c24	c24
19	Record-Route	[26] 20.30	n/a	c31	[26] 20.30	n/a	c31
19A	Referred-By	[59] 3	c19	c19	[59] 3	c20	c20
19B	Reject-Contact	[56B] 9.2	c18	c18	[56B] 9.2	c22	c22
19C	Relayed-Charge	7.2.12	n/a	c33	7.2.12	n/a	c33
19D	Request-Disposition	[56B] 9.1	c18	c18	[56B] 9.1	c22	c22
20	Require	[26] 20.32	m	m	[26] 20.32	m	m
20A	Resource-Priority	[116] 3.1	c25	c25	[116] 3.1	c25	c25
21	Route	[26] 20.34	m	m	[26] 20.34	n/a	c31
21A	Security-Client	[48] 2.3.1	c15	c15	[48] 2.3.1	n/a	n/a
21B	Security-Verify	[48] 2.3.1	c16	c16	[48] 2.3.1	n/a	n/a
21C	Session-ID	[162]	o	c32	[162]	o	c32
22	Supported	[26] 20.37	o	o	[26] 20.37	m	m
23	Timestamp	[26] 20.38	c8	c8	[26] 20.38	m	m
24	To	[26] 20.39	m	m	[26] 20.39	m	m
25	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
25A	User-to-User	[126] 7	c26	c26	[126] 7	c26	c26
26	Via	[26] 20.42	m	m	[20] 20.42	m	m
c1: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c2: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c3: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c4: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c5: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c6: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c7: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c8: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c9: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c10: IF A.4/34 AND (A.3/1 OR A.3/2A OR A.3/7) THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE, P-CSCF (IMS-ALG) or AS. c11: IF A.4/34 AND (A.3/2A OR A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the P-Access-Network-Info header extension and P-CSCF (IMS-ALG), AS acting as terminating UA, AS acting as third-party call controller or EATF. c12: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c13: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c14: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c15: IF A.4/37 OR A.4/37A THEN o ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media (note). c16: IF A.4/37 OR A.4/37A THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media. c17: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c18: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c19: IF A.4/43 THEN m ELSE n/a – – the SIP Referred-By mechanism. c20: IF A.4/43 THEN o ELSE n/a – – the SIP Referred-By mechanism. c21: IF A.3/2 THEN m ELSE IF A.4/38 THEN o ELSE n/a – – P-CSCF, the Reason header field for the session initiation protocol. c22: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c23: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c24: IF A.4/38 THEN m ELSE n/a – – the Reason header field for the session initiation protocol. c25: IF A.4/70B THEN m ELSE n/a – – inclusion of CANCEL, BYE, REGISTER and PUBLISH in communications resource priority for the session initiation protocol. c26: IF A.4/76 THEN o ELSE n/a – – transporting user to user information for call centers using SIP. c29: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), UE, UE performing the functions of an external attached network. c30: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c31: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c32: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c33: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c34: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c35: IF A.4/113 AND (A.3/1 OR A.3/2A OR A.3/7) THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE, P-CSCF (IMS-ALG) or AS. c36: IF A.4/113 AND (A.3/2A OR A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the Cellular-Network-Info header extension and P-CSCF (IMS-ALG), AS acting as terminating UA, AS acting as third-party call controller or EATF. c37: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c38: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE: Support of this header in this method is dependent on the security mechanism and the security architecture which is implemented. Use of this header in this method is not appropriate to the security mechanism defined by 3GPP TS 33.203 [19].

Prerequisite A.5/2 – – BYE request

Table A.10: Supported message bodies within the BYE request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	XML Schema for PSTN	[11B]	n/a	c1	[11B]	n/a	c1
2	VoiceXML expr / namelist data	[145] 4.2	m	c2	[145] 4.2	m	c2
3	application/vnd.3gpp.ussd	[8W]	n/a	c3	[8W]	n/a	c4
4	application/sdp	[30] 8	o	c5	[30] 8	m	c6
5	application/vnd.etsi.aoc+xml	[8N] 4.7.2	n/a	c7	[8N] 4.7.2	n/a	c8
c1: IF A.3/6 OR A.3/7A OR A.3/7B OR A.3/7D OR A.3/9B OR A.3/13B THEN o ELSE n/a – – MGCF, AS acting as terminating UA, or redirect server, AS acting as originating UA, AS performing 3rd party call control, IBCF (IMS-ALG), ISC gateway function (IMS-ALG). c2: IF A.4/84 THEN m ELSE n/a – – SIP Interface to VoiceXML Media Services. c3: IF A.3A/93 OR A.3/9 OR A.3/2 OR A.3A/89 THEN m ELSE n/a – – USSI AS, IBCF, P-CSCF, ATCF (UA). c4: IF A.3A/92 OR A.3/9 OR A.3/2 OR A.3A/89 THEN m ELSE n/a – – USSI UE, IBCF, P-CSCF, ATCF (UA). c5: IF A.4/16 THEN o ELSE n/a – – integration of resource management and SIP. c6: IF A.4/16 THEN m ELSE n/a – – integration of resource management and SIP. c7 IF A.3A/53 THEN m ELSE n/a – – Advice of charge application server. c8 IF A.3A/54 THEN m ELSE n/a – – Advice of charge UA client.

TableA.11: Void

Prerequisite A.5/3 – – BYE response

Prerequisite: A.6/1 – – Additional for 100 (Trying) response

Table A.11A: Supported header fields within the BYE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
6	To	[26] 20.39	m	m	[26] 20.39	m	m
7	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses.

Prerequisite A.5/3 – – BYE response for all remaining status-codes

Table A.12: Supported header fields within the BYE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Allow	[26] 20.5	c11	c11	[26] 20.5	m	m
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
1A	Cellular-Network-Info	7.2.15	n/a	c19	7.2.15	n/a	c20
2	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
3	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
3A	Content-ID	[256] 3.2	o	c21	[256] 3.2	m	c22
4	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
5	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
6	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
7	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
8	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
9	From	[26] 20.20	m	m	[26] 20.20	m	m
9A	Geolocation-Error	[89] 4.3	c12	c12	[89] 4.3	c12	c12
10	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
10A	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c5	c6	[52] 4.4, [52A] 4, [234] 2	c5	c7
10B	P-Asserted-Identity	[34] 9.1	n/a	n/a	[34] 9.1	c3	c3
10C	P-Charging-Function-Addresses	[52] 4.5, [52A] 4	c9	c10	[52] 4.5, [52A] 4	c9	c10
10D	P-Charging-Vector	[52] 4.6, [52A] 4	c8	c18	[52] 4.6, [52A] 4	c8	c18
10F	P-Preferred-Identity	[34] 9.2	c3	x	[34] 9.2	n/a	n/a
10G	Privacy	[33] 4.2	c4	n/a	[33] 4.2	c4	c4
10H	Relayed-Charge	7.2.12	n/a	c17	7.2.12	n/a	c17
10I	Require	[26] 20.32	m	m	[26] 20.32	m	m
10J	Server	[26] 20.35	o	o	[26] 20.35	o	o
10K	Session-ID	[162]	o	c16	[162]	o	c16
11	Timestamp	[26] 20.38	m	m	[26] 20.38	c2	c2
12	To	[26] 20.39	m	m	[26] 20.39	m	m
12A	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
12B	User-to-User	[126] 7	c13	c13	[126] 7	c13	c13
13	Via	[26] 20.42	m	m	[26] 20.42	m	m
14	Warning	[26] 20.43	o (note)	o (note)	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c3: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c4: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c5: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c6: IF A.4/34 AND (A.3/1 OR A.3/2A ORA.3/7) THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE, P-CSCF (IMS-ALG), or AS. c7: IF A.4/34 AND (A.3/2A OR A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the P-Access-Network-Info header extension and P-CSCF (IMS-ALG), AS acting as terminating UA, AS acting as third-party call controller or EATF. c8: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c9: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c10: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c11: IF A.6/18 THEN m ELSE o – – 405 (Method Not Allowed). c12: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c13: IF A.4/76 THEN o ELSE n/a – – transporting user to user information for call centers using SIP. c16: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c17: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c18: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c19: IF A.4/113 AND (A.3/1 OR A.3/2A OR A.3/7) THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE, P-CSCF (IMS-ALG), or AS. c20: IF A.4/113 AND (A.3/2A OR A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the Cellular-Network-Info header extension and P-CSCF (IMS-ALG), AS acting as terminating UA, AS acting as third-party call controller or EATF. c21: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c22: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE: For a 488 (Not Acceptable Here) response, RFC 3261 [26] gives the status of this header as SHOULD rather than OPTIONAL.

Prerequisite A.5/3 – – BYE response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.13: Supported header fields within the BYE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Accept-Resource-Priority	[116] 3.2	c5	c5	[116] 3.2	c5	c5
0B	Allow-Events	[28] 8.2.2	c3	c3	[28] 8.2.2	c4	c4
1	Authentication-Info	[26] 20.6	c1	c1	[26] 20.6	c2	c2

4	Supported	[26] 20.37	o	m	[26] 20.37	m	m
c1: IF A.4/7 THEN o ELSE n/a – – authentication between UA and UA. c2: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c3: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c4: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c5: IF A.4/70B THEN m ELSE n/a – – inclusion of CANCEL, BYE, REGISTER and PUBLISH in communications resource priority for the session initiation protocol.

Prerequisite A.5/3 – – BYE response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.13A: Supported header fields within the BYE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	o
2	Response-Source	7.2.17	n/a	c1	7.2.17	n/a	c1
c1: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses?

Prerequisite A.5/3 – – BYE response

Prerequisite: A.6/103 OR A.6/35 – – Additional for 3xx or 485 (Ambiguous) response

Table A.14: Supported header fields within the BYE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0B	Contact	[26] 20.10	o (note)	o	[26] 20.10	m	m
NOTE: RFC 3261 [26] gives the status of this header as SHOULD rather than OPTIONAL.

Prerequisite A.5/3 – – BYE response

Prerequisite: A.6/14 – – Additional for 401 (Unauthorized) response

Table A.15: Supported header fields within the BYE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
2	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
8	WWW-Authenticate	[26] 20.44	m	m	[26] 20.44	m	m
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/3 – – BYE response

Prerequisite: A.6/17 OR A.6/23 OR A.6/30 OR A.6/36 OR A.6/42 OR A.6/45 OR A.6/50 OR A.6/51 – – Additional for 404 (Not Found), 413 (Request Entity Too Large), 480(Temporarily not available), 486 (Busy Here), 500 (Internal Server Error), 503 (Service Unavailable), 600 (Busy Everywhere), 603 (Decline) response

Table A.16: Supported header fields within the BYE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.17: Void

Prerequisite A.5/3 – – BYE response

Prerequisite: A.6/19 – – Additional for 407 (Proxy Authentication Required) response

Table A.18: Supported header fields within the BYE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
2	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
6	WWW-Authenticate	[26] 20.44	o	o	[26] 20.44	o	o
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/3 – – BYE response

Prerequisite A.6/25 – – Additional for 415 (Unsupported Media Type) response

Table A.19: Supported header fields within the BYE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o.1	o.1	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o.1	o.1	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o.1	o.1	[26] 20.3	m	m
o.1 At least one of these capabilities is supported.

Prerequisite A.5/3 – – BYE response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.19A: Supported header fields within the BYE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70B THEN m ELSE n/a – – inclusion of CANCEL, BYE, REGISTER and PUBLISH in communications resource priority for the session initiation protocol.

Prerequisite A.5/3 – – BYE response

Prerequisite: A.6/27 – – Additional for 420 (Bad Extension) response

Table A.20: Supported header fields within the BYE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
5	Unsupported	[26] 20.40	m	m	[26] 20.40	m	m

Prerequisite A.5/3 – – BYE response

Prerequisite: A.6/28 OR A.6/41A – – Additional for 421 (Extension Required), 494 (Security Agreement Required) response

Table A.20A: Supported header fields within the BYE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Security-Server	[48] 2	x	x	[48] 2	c1	c1
c1: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol.

Table A.21: Void

Prerequisite A.5/3 – – BYE response

Prerequisite: A.6/6 – – Additional for 200 (OK) response

Table A.22: Supported message bodies within the BYE response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	VoiceXML expr / namelist data	[145] 4.2	o	c1	[145] 4.2	o	c1
2	application/vnd.etsi.aoc+xml	[8N] 4.7.2	n/a	c2	[8N] 4.7.2	n/a	c3
c1: IF A.4/84 THEN o ELSE n/a – – SIP Interface to VoiceXML Media Services. c2 IF A.3A/53 THEN m ELSE n/a – – Advice of charge application server. c3 IF A.3A/54 THEN m ELSE n/a – – Advice of charge UA client.

A.2.1.4.4 CANCEL method

Prerequisite A.5/4 – – CANCEL request

Table A.23: Supported header fields within the CANCEL request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Contact	[56B] 9.2	c9	c9	[56B] 9.2	c11	c11
5	Authorization	[26] 20.7	c3	c3	[26] 20.7	c3	c3
6	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
8	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
8A	Content-Type	[26] 20.15	c22	c22	[26] 20.15	o	o
9	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
10	Date	[26] 20.17	c4	c4	[26] 20.17	m	m
11	From	[26] 20.20	m	m	[26] 20.20	m	m
11A	Max-Breadth	[117] 5.8	n/a	c16	[117] 5.8	c17	c17
12	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c18
14	Privacy	[33] 4.2	c6	n/a	[33] 4.2	c6	n/a
15	Reason	[34A] 2	c7	c10	[34A] 2	c12	c12
16	Record-Route	[26] 20.30	n/a	c18	[26] 20.30	n/a	c18
17	Reject-Contact	[56B] 9.2	c9	c9	[56B] 9.2	c11	c11
17A	Relayed-Charge	7.2.12	n/a	c21	7.2.12	n/a	c21
17B	Request-Disposition	[56B] 9.1	c9	c9	[56B] 9.1	c11	c11
17C	Resource-Priority	[116] 3.1	c13	c13	[116] 3.1	c13	c13
18	Route	[26] 20.34	m	m	[26] 20.34	n/a	c18
18A	Session-ID	[162]	o	c19	[162]	o	c19
19	Supported	[26] 20.37	o	o	[26] 20.37	m	m
20	Timestamp	[26] 20.38	c8	c8	[26] 20.38	m	m
21	To	[26] 20.39	m	m	[26] 20.39	m	m
22	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
23	Via	[26] 20.42	m	m	[26] 20.42	m	m
c3: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c4: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c6: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c7: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c8: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c9: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c10: IF A.3/2 THEN m ELSE IF A.4/38 THEN o ELSE n/a – – P-CSCF, the Reason header field for the session initiation protocol. c11: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c12: IF A.4/38 THEN m ELSE n/a – – the Reason header field for the session initiation protocol. c13: IF A.4/70B THEN m ELSE n/a – – inclusion of CANCEL, BYE, REGISTER and PUBLISH in communications resource priority for the session initiation protocol. c16: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), UE, UE performing the functions of an external attached network.. c17: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c18: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c19: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c21: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c22: IF A.4/16 OR A.24/1 THEN m ELSE o – – integration of resource management and SIP or XML Schema for PSTN.

Prerequisite A.5/4 – – CANCEL request

Table A.24: Supported message bodies within the CANCEL request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	XML Schema for PSTN	[11B]		c1	[11B]		c1
2	application/sdp	[30] 8	o	c2	[30] 8	m	c3
c1: IF A.3/6 OR A.3/7A OR A.3/7B OR A.3/7D OR A.3/9B OR A.3/13B THEN o ELSE n/a – – MGCF, AS acting as terminating UA, or redirect server, AS acting as originating UA, AS performing 3rd party call control, IBCF (IMS-ALG), ISC gateway function (IMS-ALG). c2: IF A.4/16 THEN o ELSE n/a – – integration of resource management and SIP. c3: IF A.4/16 THEN m ELSE n/a – – integration of resource management and SIP.

Prerequisite A.5/5 – – CANCEL response for all status-codes

Table A.25: Supported header fields within the CANCEL response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
5C	Privacy	[33] 4.2	c3	n/a	[33] 4.2	c3	n/a
5D	Relayed-Charge	7.2.12	n/a	c8	7.2.12	n/a	c8
5E	Session-ID	[162]	o	c6	[162]	o	c6
6	Timestamp	[26] 20.38	m	m	[26] 20.38	c2	c2
7	To	[26] 20.39	m	m	[26] 20.39	m	m
7A	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
8	Via	[26] 20.42	m	m	[26] 20.42	m	m
9	Warning	[26] 20.43	o (note)	o	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c3: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c6: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c8: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension.
NOTE: For a 488 (Not Acceptable Here) response, RFC 3261 [26] gives the status of this header as SHOULD rather than OPTIONAL.

Prerequisite A.5/5 – – CANCEL response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.26: Supported header fields within the CANCEL response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
4	Supported	[26] 20.37	o	m	[26] 20.37	m	m
c1: IF A.4/70B THEN m ELSE n/a – – inclusion of CANCEL, BYE, REGISTER and PUBLISH in communications resource priority for the session initiation protocol.

Prerequisite A.5/5 – – CANCEL response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.26A: Supported header fields within the CANCEL response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	O
2	Response-Source	7.2.17	n/a	c1	7.2.17	n/a	c1
c1: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses?

Table A.27: Void

Prerequisite A.5/5 – – CANCEL response

Table A.28: Supported header fields within the CANCEL response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.29: Void

Table A.30: Void

Prerequisite A.5/5 – – CANCEL response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.30A: Supported header fields within the CANCEL response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70B THEN m ELSE n/a – – inclusion of CANCEL, BYE, REGISTER and PUBLISH in communications resource priority for the session initiation protocol.

Prerequisite A.5/5 – – CANCEL response

Table A.31: Supported message bodies within the CANCEL response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

A.2.1.4.5 Void

A.2.1.4.6 INFO method

Prerequisite A.5/6 – – INFO request

Table A.32: Supported header fields within the INFO request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o	o	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
4	Allow	[26] 20.5	o	o	[26] 20.5	m	m
5	Allow-Events	[28] 8.2.2	c1	c1	[28] 8.2.2	c2	c2
6	Authorization	[26] 20.7	c3	c3	[26] 20.7	c3	c3
7	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
7A	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
8	Cellular-Network-Info	7.2.15	n/a	c45	7.2.15	n/a	c46
9	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
10	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
10A	Content-ID	[256] 3.2	o	c47	[256] 3.2	m	c48
11	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
12	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
13	Content-Type	[26] 20.15	m	m	[26] 29.15	m	m
14	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
15	Date	[26] 20.17	c4	c4	[26] 20.17	m	m
16	From	[26] 20.20	m	m	[26] 20.20	m	m
17	Geolocation	[89] 4.1	c29	c29	[89] 4.1	c29	c29
17A	Geolocation-Routing	[89] 4.2	c29	c29	[89] 4.2	c29	c29
18	Info-Package	[25] 7.2	c42	c42	[25] 7.2	c42	c42
19	Max-Breadth	[117] 5.8	n/a	c39	[117] 5.8	c40	c40
20	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c41
21	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
22	P-Access-Network-Info	[52] 4.4, [234] 2	c15	c16	[52] 4.4, [234] 2	c15	c17
23	P-Charging-Function-Addresses	[52] 4.5	c20	c21	[52] 4.5	c20	c21
24	P-Charging-Vector	[52] 4.6	c18	c19	[52] 4.6	c18	c19
26	Privacy	[33] 4.2	c12	c12	[33] 4.2	c12	c12
27	Proxy-Authorization	[26] 20.28	c5	c5	[26] 20.28	n/a	n/a
28	Proxy-Require	[26] 20.29	o	n/a	[26] 20.29	n/a	n/a
29	Reason	[34A] 2	c6	c6	[34A] 2	c6	c6
30	Record-Route	[26] 20.30	n/a	c41	[26] 20.30	n/a	c41
31	Referred-By	[59] 3	c25	c25	[59] 3	c26	c26
32	Relayed-Charge	7.2.12	n/a	c44	7.2.12	n/a	c44
33	Request-Disposition	[56B] 9.1	c24	c24	[56B] 9.1	c28	c28
34	Require	[26] 20.32	m	m	[26] 20.32	m	m
35	Resource-Priority	[116] 3.1	c30	c30	[116] 3.1	c30	c30
36	Route	[26] 20.34	m	m	[26] 20.34	n/a	c41
37	Security-Client	[48] 2.3.1	c22	c22	[48] 2.3.1	n/a	n/a
38	Security-Verify	[48] 2.3.1	c23	c23	[48] 2.3.1	n/a	n/a
38A	Session-ID	[162]	o	c43	[162]	o	c43
39	Subject	[26] 20.35	o	o	[26] 20.36	o	o
40	Supported	[26] 20.37	m	m	[26] 20.37	m	m
41	Timestamp	[26] 20.38	c10	c10	[26] 20.38	m	m
42	To	[26] 20.39	m	m	[26] 20.39	m	m
43	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
44	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c2: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c3: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c4: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c5: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c6: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c10: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c12: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c15: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c16: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c17: IF A.4/34 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c18: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c19: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c20: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c21: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c22: IF A.4/37 OR A.4/37A THEN o ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media? (note 2). c23: IF A.4/37 OR A.4/37A THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media. c24 IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c25: IF A.4/43 THEN m ELSE n/a – – the SIP Referred-By mechanism. c26: IF A.4/43 THEN o ELSE n/a – – the SIP Referred-By mechanism. c28: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c29: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c30: IF A.4/70A THEN m ELSE n/a – – inclusion of INFO, SUBSCRIBE, NOTIFY in communications resource priority for the session initiation protocol. c39: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), UE, UE performing the functions of an external attached network. c40: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c41: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c42: IF A.4/13A THEN n/a ELSE m – – legacy INFO usage. c43: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c44: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c45: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c46: IF A.4/113 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c47: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c48: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE 2: Support of this header field in this method is dependent on the security mechanism and the security architecture which is implemented. Use of this header field in this method is not appropriate to the security mechanism defined by 3GPP TS 33.203 [19].

Prerequisite A.5/6 – – INFO request

Table A.33: Supported message bodies within the INFO request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Info-Package	[25]	m	m	[25]	m	m
2	application/vnd.etsi.aoc+xml	[8N] 4.7.2	n/a	c1	[8N] 4.7.2	n/a	c2
3	application/EmergencyCallData.eCall.MSD	[244] 14.3	m	c3	[244] 14.3	m	c4
4	application/EmergencyCallData.Control+xml	[244] 14.4	m	c3	[244] 14.4	m	c3
c1: IF A.3A/53 THEN m ELSE n/a – – Advice of charge application server. c2: IF A.3A/54 THEN m ELSE n/a – – Advice of charge UA client. c3: IF (A.3/1 AND A.4/120) THEN m ELSE IF ((A.3/2A OR A.3/11A OR A.3A/84) AND A.4/120) THEN i ELSE n/a – – UE, Next-Generation Pan-European eCall emergency service, P-CSCF (IMS-ALG), E-CSCF acting as UA, EATF. c4: IF ((A.3/2A OR A.3/11A OR A.3A/84) AND A.4/120) THEN i ELSE n/a – – P-CSCF (IMS-ALG), E-CSCF acting as UA, EATF, Next-Generation Pan-European eCall emergency service.

Prerequisite A.5/7 – – INFO response

Prerequisite: A.6/1 – – Additional for 100 (Trying) response

Table A.34: Supported header fields within the INFO response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
6	To	[26] 20.39	m	m	[26] 20.39	m	m
7	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses.

Prerequisite A.5/7 – – INFO response for all remaining status-codes

Table A.35: Supported header fields within the INFO response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Allow	[26] 20.5	c12	c12	[26] 20.5	m	m
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
2A	Cellular-Network-Info	7.2.15	n/a	c19	7.2.15	n/a	c20
3	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
4	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
4A	Content-ID	[256] 3.2	o	c21	[256] 3.2	m	c22
5	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
6	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
7	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
8	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
9	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
10	From	[26] 20.20	m	m	[26] 20.20	m	m
11	Geolocation-Error	[89] 4.3	c14	c14	[89] 4.3	c14	c14
12	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
13	Organization	[26] 20.25	o	o	[26] 20.25	o	o
14	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c5	c6	[52] 4.4, [52A] 4, [234] 2	c5	c7
15	P-Charging-Function-Addresses	[52] 4.5, [52A] 4	c10	c11	[52] 4.5, [52A] 4	c10	c11
16	P-Charging-Vector	[52] 4.6, [52A] 4	c8	c9	[52] 4.6, [52A] 4	c8	c9
18	Privacy	[33] 4.2	c4	c4	[33] 4.2	c4	c4
18A	Relayed-Charge	7.2.12	n/a	c18	7.2.12	n/a	c18
19	Require	[26] 20.32	m	m	[26] 20.32	m	m
20	Server	[26] 20.35	o	o	[26] 20.35	o	o
20A	Session-ID	[162]	o	c17	[162]	o	c17
21	Timestamp	[26] 20.38	m	m	[26] 20.38	c2	c2
22	To	[26] 20.39	m	m	[26] 20.39	m	m
23	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
24	Via	[26] 20.42	m	m	[26] 20.42	m	m
25	Warning	[26] 20.43	o	o	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c4: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c5: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c6: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c7: IF A.4/34 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c8: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c9: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c10: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c11: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c12: IF A.6/18 THEN m ELSE o – – 405 (Method Not Allowed). c14: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c17: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c18: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c19: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c20: IF A.4/113 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c21: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c22: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).

Prerequisite A.5/7 – – INFO response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.36: Supported header fields within the INFO response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o	o	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
4	Accept-Resource-Priority	[116] 3.2	c5	c5	[116] 3.2	c5	c5
5	Allow-Events	[28] 8.2.2	c3	c3	[28] 8.2.2	c4	c4
6	Authentication-Info	[26] 20.6	c1	c1	[26] 20.6	c2	c2

9	Supported	[26] 20.37	o	o	[26] 20.37	m	m
c1: IF A.4/7 THEN o ELSE n/a – – authentication between UA and UA. c2: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c3: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c4: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c5: IF A.4/70A THEN m ELSE n/a – – inclusion of INFO, SUBSCRIBE, NOTIFY in communications resource priority for the session initiation protocol.

Prerequisite A.5/7 – – INFO response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.37: Supported header fields within the INFO response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	o
2	Response-Source	7.2.17	n/a	c1	7.2.17	n/a	c1
c1: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses?

Prerequisite A.5/7 – – INFO response

Prerequisite: A.6/103 – – Additional for 3xx or 485 (Ambiguous) response

Table A.37A: Void

Prerequisite A.5/7 – – INFO response

Prerequisite: A.6/14 – – Additional for 401 (Unauthorized) response

Table A.38: Supported header fields within the INFO response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
6	WWW-Authenticate	[26] 20.44	m	m	[26] 20.44	m	m
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/7 – – INFO response

Prerequisite: A.6/17 OR A.6/23 OR A.6/30 OR A.6/36 OR A.6/42 OR A.6/45 OR A.6/50 OR A.6/51 – – Additional for 404 (Not Found), 413 (Request Entity Too Large), 480 (Temporarily not available), 486 (Busy Here), 500 (Internal Server Error), 503 (Service Unavailable), 600 (Busy Everywhere), 603 (Decline) response

Table A.39: Supported header fields within the INFO response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.40: Void

Prerequisite A.5/7 – – INFO response

Prerequisite: A.6/25 – – Additional for 415 (Unsupported Media Type) response

Table A.41: Supported header fields within the INFO response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o.1	o.1	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o.1	o.1	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o.1	o.1	[26] 20.3	m	m
o.1 At least one of these capabilities is supported.

Prerequisite A.5/7 – – INFO response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.41A: Supported header fields within the INFO response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70A THEN m ELSE n/a – – inclusion of INFO, SUBSCRIBE, NOTIFY in communications resource priority for the session initiation protocol.

Prerequisite A.5/7 – – INFO response

Prerequisite: A.6/27 – – Additional for 420 (Bad Extension) response

Table A.42: Supported header fields within the INFO response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
5	Unsupported	[26] 20.40	m	m	[26] 20.40	m	m

Prerequisite A.5/7 – – INFO response

Prerequisite: A.6/28 OR A.6/41A – – Additional for 421 (Extension Required), 494 (Security Agreement Required) response

Table A.42A: Supported header fields within the INFO response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Security-Server	[48] 2	x	x	[48] 2	c1	c1
c1: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol.

Table A.43: Void

Table A.44: Void

Prerequisite A.5/7 – – INFO response

Table A.45: Supported message bodies within the INFO response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

A.2.1.4.7 INVITE method

Prerequisite A.5/8 – – INVITE request

Table A.46: Supported header fields within the INVITE request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o	c47	[26] 20.1	m	m
1A	Accept-Contact	[56B] 9.2	c24	c24	[56B] 9.2	c32	c32
2	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
3A	Additional-Identity	7.2.20	n/a	c75	7.2.20	n/a	c76
4	Alert-Info	[26] 20.4	o	o	[26] 20.4	c1	c1
5	Allow	[26] 20.5, [26] 5.1	o (note 1)	o	[26] 20.5, [26] 5.1	m	m
6	Allow-Events	[28] 8.2.2	c2	c2	[28] 8.2.2	c53	c53
6A	Attestation-Info	7.2.18	n/a	c71	7.2.18	n/a	c71
7	Answer-Mode	[158]	c49	c49	[158]	c50	c50
8	Authorization	[26] 20.7	c3	c3	[26] 20.7	c3	c3
9	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
10	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
10A	Cellular-Network-Info	7.2.15	n/a	c63	7.2.15	n/a	c64
11	Contact	[26] 20.10	m	m	[26] 20.10	m	m
12	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
13	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
13A	Content-ID	[256] 3.2	o	c69	[256] 3.2	m	c70
14	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
15	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
16	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
17	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
18	Date	[26] 20.17	c4	c4	[26] 20.17	m	m
19	Expires	[26] 20.19	o	o	[26] 20.19	o	o
19A	Feature-Caps	[190]	c59	c59	[190]	c58	c58
20	From	[26] 20.20	m	m	[26] 20.20	m	m
20A	Geolocation	[89] 4.1	c33	c33	[89] 4.1	c33	c33
20B	Geolocation-Routing	[89] 4.2	c33	c33	[89] 4.2	c33	c33
20C	History-Info	[66] 4.1	c31	c31	[66] 4.1	c31	c31
20D	Identity	[252] 4	c68	c68	[252] 4	c68	c68
21	In-Reply-To	[26] 20.21	o	o	[26] 20.21	o	o
21A	Join	[61] 7.1	c30	c30	[61] 7.1	c30	c30
21B	Max-Breadth	[117] 5.8	n/a	c45	[117] 5.8	c46	c46
22	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c52
23	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
23A	Min-SE	[58] 5	c26	c26	[58] 5	c25	c25
24	Organization	[26] 20.25	o	o	[26] 20.25	o	o
24AA	Origination-Id	7.2.19	n/a	c72	7.2.19	n/a	c72
24A	P-Access-Network-Info	[52] 4.4, [234] 2	c15	c16	[52] 4.4, [234] 2	c15	c17
24B	P-Asserted-Identity	[34] 9.1	n/a	c65	[34] 9.1	c7	c7
24C	P-Asserted-Service	[121] 4.1	n/a	c67	[121] 4.1	c38	c38
24D	P-Called-Party-ID	[52] 4.2	x	x	[52] 4.2	c13	c13
24E	P-Charging-Function-Addresses	[52] 4.5	c20	c21	[52] 4.5	c20	c21
24F	P-Charging-Vector	[52] 4.6	c18	c19	[52] 4.6	c18	c19
24H	P-Early-Media	[109] 8	c34	c34	[109] 8	c34	c34
25	P-Media-Authorization	[31] 5.1	n/a	n/a	[31] 5.1	c11	c12
25A	P-Preferred-Identity	[34] 9.2	c7	c5	[34] 9.2	n/a	n/a
25B	P-Preferred-Service	[121] 4.2	c37	c36	[121] 4.2	n/a	n/a
25C	P-Private-Network-Indication	[134]	c42	c42	[134]	c42	c42
25D	P-Profile-Key	[97] 5	n/a	n/a	[97] 5	n/a	n/a
25E	P-Served-User	[133] 6	c51	c51	[133] 6	c51	c51
25F	P-User-Database	[82] 4	n/a	n/a	[82] 4	n/a	n/a
25G	P-Visited-Network-ID	[52] 4.3	x (note 3)	x	[52] 4.3	c14	n/a
26	Priority	[26] 20.26	o	o	[26] 20.26	o	o
26AA	Priority-Share	Subclause 7.2.16	n/a	c66	Subclause 7.2.16	n/a	c66
26AB	Priority-Verstat	Subclause 7.2.21	n/a	c77	Subclause 7.2.21	n/a	c78
26A	Privacy	[33] 4.2	c9	c9	[33] 4.2	c9	c9
26B	Priv-Answer-Mode	[158]	c49	c49	[158]	c50	c50
27	Proxy-Authorization	[26] 20.28	c6	c6	[26] 20.28	n/a	n/a
28	Proxy-Require	[26] 20.29	o (note 2)	o (note 2)	[26] 20.29	n/a	n/a
28A	Reason	[34A] 2	c8	c8	[34A] 2	c8	c55
29	Record-Route	[26] 20.30	n/a	c52	[26] 20.30	m	m
29A	Recv-Info	[25] 5.2.3	c48	c48	[25] 5.2.3	c48	c48
30	Referred-By	[59] 3	c27	c27	[59] 3	c28	c28
31	Reject-Contact	[56B] 9.2	c24	c24	[56B] 9.2	c32	c32
31A	Relayed-Charge	7.2.12	n/a	c61	7.2.12	n/a	c61
31B	Replaces	[60] 6.1	c29	c29	[60] 6.1	c29	c29
31C	Reply-To	[26] 20.31	o	o	[26] 20.31	o	o
31D	Request-Disposition	[56B] 9.1	c24	c24	[56B] 9.1	c32	c32
32	Require	[26] 20.32	m	m	[26] 20.32	m	m
32A	Resource-Priority	[116] 3.1	c35	c35	[116] 3.1	c35	c35
32B	Restoration-Info	Subclause 7.2.11	n/a	n/a	Subclause 7.2.11	n/a	c60
32C	Resource-Share	Subclause 7.2.13	n/a	c62	Subclause 7.2.13	n/a	c62
33	Route	[26] 20.34	m	m	[26] 20.34	n/a	c52
33A	Security-Client	[48] 2.3.1	c22	c22	[48] 2.3.1	n/a	n/a
33B	Security-Verify	[48] 2.3.1	c23	c23	[48] 2.3.1	n/a	n/a
33DA	Service-Interact-Info	Subclause 7.2.14	n/a	c73	Subclause 7.2.14	n/a	c74
33D	Session-Expires	[58] 4	c25	c25	[58] 4	c25	c25
33E	Session-ID	[162]	o	c54	[162]	o	c54
34	Subject	[26] 20.36	o	o	[26] 20.36	o	o
35	Supported	[26] 20.37	m	m	[26] 20.37	m	m
35A	Target-Dialog	[184] 7	c56	c56	[184] 7	c57	c57
36	Timestamp	[26] 20.38	c10	c10	[26] 20.38	m	m
37	To	[26] 20.39	m	m	[26] 20.39	m	m
37A	Trigger-Consent	[125] 5.11.2	c39	c39	[125] 5.11.2	c40	c40
38	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
38A	User-to-User	[126] 7	c41	c41	[126] 7	c41	c41
39	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/12 THEN m ELSE n/a – – downloading of alerting information. c2: IF A.4/22 THEN m ELSE n/a – – acting as the notifier of event information. c3: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c4: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c5: IF A.3/1 AND A.4/25 THEN o ELSE n/a – – UE and private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c6: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c7: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c8: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c9: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c10: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c11: IF A.4/19 THEN m ELSE n/a – – SIP extensions for media authorization. c12: IF A.3/1 AND A.4/19 THEN m ELSE n/a – – UE, SIP extensions for media authorization. c13: IF A.4/32 THEN o ELSE n/a – – the P-Called-Party-ID extension. c14: IF A.4/33 THEN o ELSE n/a – – the P-Visited-Network-ID extension. c15: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c16: IF A.4/34 AND (A.3/1 OR A.3/2A OR A.3/7 OR A.3A/81 OR A.3A/81A OR A.3A/81B OR A.3/6) THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE, P-CSCF (IMS-ALG), the AS, the MSC server enhanced for ICS, MSC server enhanced for SRVCC using SIP interface, MSC server enhanced for DRVCC using SIP interface or MGCF. c17: IF A.4/34 AND (A.3/2A OR A.3A/81 OR A.3/7A OR A.3/7D OR A3A/84 OR A.3/6) THEN m ELSE n/a – – the P-Access-Network-Info header extension and P-CSCF (IMS-ALG), the MSC server enhanced for ICS, AS acting as terminating UA, AS acting as third-party call controller, EATF or MGCF. c18: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c19: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c20: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c21: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c22: IF A.4/37 OR A.4/37A THEN o ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media (note 4). c23: IF A.4/37 OR A.4/37A THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media. c24: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c25: IF A.4/42 THEN m ELSE n/a – – the SIP session timer. c26: IF A.4/42 THEN o ELSE n/a – – the SIP session timer. c27: IF A.4/43 THEN m ELSE n/a – – the SIP Referred-By mechanism. c28: IF A.4/43 THEN o ELSE n/a – – the SIP Referred-By mechanism. c29: IF A.4/44 THEN m ELSE n/a – – the Session Inititation Protocol (SIP) "Replaces" header. c30: IF A.4/45 THEN m ELSE n/a – – the Session Inititation Protocol (SIP) "Join" header. c31: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c32: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c33: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c34: IF A.4/66 THEN m ELSE n/a – – The SIP P-Early-Media private header extension for authorization of early media. c35: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol. c36: IF (A.3/1 OR A.3A/81 OR A.3A/81A OR A.3A/81B) AND A.4/74 THEN o ELSE n/a – – UE, MSC Server enhanced for ICS, MSC server enhanced for SRVCC using SIP interface, MSC server enhanced for DRVCC using SIP interface and SIP extension for the identification of services. c37: IF A.4/74 THEN o ELSE n/a – – SIP extension for the identification of services. c38: IF A.4/74 THEN m ELSE n/a – – SIP extension for the identification of services. c39: IF A.4/75A THEN m ELSE n/a – – a relay within the framework for consent-based communications in SIP. c40: IF A.4/75B THEN m ELSE n/a – – a recipient within the framework for consent-based communications in SIP. c41: IF A.4/76 THEN o ELSE n/a – – transporting user to user information for call centers using SIP. c42: IF A.4/77 THEN m ELSE n/a – – the SIP P-Private-Network-Indication private-header (P-Header). c45: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), UE, UE performing the functions of an external attached network. c46: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c47: IF A.3/1 AND A.4/2B THEN m ELSE o – – UE and initiating a session. c48: IF A.4/13 THEN m ELSE IF A.4/13A THEN m ELSE n/a – – SIP INFO method and package framework, legacy INFO usage.
c49: IF A.4/87 THEN o ELSE n/a – – requesting answering modes for SIP. c50: IF A.4/87 THEN m ELSE n/a – – requesting answering modes for SIP. c51: IF A.4/78 THEN m ELSE n/a – – the SIP P-Served-User private header. c52: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c53: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c54: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c55: IF A.4/38 THEN IF A.3A/83 THEN m ELSE o ELSE n/a – – the Reason header field for the session initiation protocol, SCC application server. c56: IF A.4/99 THEN o ELSE n/a – – request authorization through dialog Identification in the session initiation protocol. c57: IF A.4/99 THEN m ELSE n/a – – request authorization through dialog Identification in the session initiation protocol. c58: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c59: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network. c60: IF A. 4/109 THEN o ELSE n/a – – PCRF based P-CSCF restoration. c61: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c62: IF A.4/112 THEN o ELSE n/a – – resource sharing. c63: IF A.4/113 AND (A.3/1 OR A.3/2A OR A.3/7) THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE, P-CSCF (IMS-ALG) or the AS. c64: IF A.4/113 AND (A.3/2A OR A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE IF A.4/113 AND A.3/6 THEN o ELSE n/a – – the Cellular-Network-Info header extension and P-CSCF (IMS-ALG), AS acting as terminating UA or AS acting as third-party call controller, EATF or MGCF. c65: IF A.4/25 AND (A.3/6 OR A.3/7B OR A.3/8 OR A.3A/81 OR A.3A/81A OR A.3A/81B OR A.3A/83 OR A.3A/89) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and MGCF, AS acting as originating UA, MRFC, MSC Server enhanced for ICS, MSC server enhanced for SRVCC using SIP interface, MSC server enhanced for DRVCC using SIP interface, SCC application server, ATCF (UA). c66: IF A.4/114 THEN o ELSE n/a – – priority sharing. c67: IF A.4/74 AND A.3/7B THEN o ELSE n/a – – SIP extension for the identification of services and AS acting as originating UA. c68: IF A.4/116 AND (A.3/7 OR A.3/9) THEN m ELSE n/a – – authenticated identity management in the Session Initiation Protocol, AS, IBCF. c69: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c70: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c71: IF A.4/121 AND (A.3/6 OR A.3/7 OR A.3/9) THEN m ELSE n/a – – the Attestation-Info header field extension, MGCF, AS, IBCF. c72: IF A.4/122 AND (A.3/6 OR A.3/7 OR A.3/9) THEN m ELSE n/a – – the Origination-Id header field extension, MGCF, AS, IBCF. c73: IF A.4/123 AND (A.3/7 OR A.3/9) THEN m ELSE n/a – – Dynamic services interactions, AS, IBCF. c74: IF A.4/123 AND (A.3/2 OR A.3/7 OR A.3/9) THEN m ELSE n/a – – Dynamic services interactions, P-CSCF, AS, IBCF. c75: IF A.4/124 THEN o ELSE n/a – – the Additional-Identity header field extension. c76: IF A.4/124 THEN m ELSE n/a – – the Additional-Identity header field extension. c77: IF A.4/70 AND A.4/126 AND A.3/9 THEN m ELSE n/a – – communications resource priority for the session initiation protocol, the Priority-Verstat header field extension, IBCF. c78: IF A.4/70 AND A.4/126 THEN o ELSE n/a – – communications resource priority for the session initiation protocol, the Priority-Verstat header field extension. o.1: At least one of these shall be supported.
NOTE 1: RFC 3261 [26] gives the status of this header as SHOULD rather than OPTIONAL. NOTE 2: No distinction has been made in these tables between first use of a request on a From/To/Call-ID combination, and the usage in a subsequent one. Therefore the use of "o" etc. above has been included from a viewpoint of first usage. NOTE 3: The strength of this requirement in RFC 7315 [52] is SHOULD NOT, rather than MUST NOT. NOTE 4: Support of this header in this method is dependent on the security mechanism and the security architecture which is implemented. Use of this header in this method is not appropriate to the security mechanism defined by 3GPP TS 33.203 [19].

Prerequisite A.5/8 – – INVITE request

Table A.47: Supported message bodies within the INVITE request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	XML Schema for PSTN	[11B]		c1	[11B]		c1
2	application/vnd.3gpp.ussd	[8W]		c2	[8W]		c3
3	application/vnd.3gpp.mcptt-info+xml	[8ZE]	n/a	c4	[8ZE]	n/a	c4
4	application/vnd.etsi.aoc+xml	[8N] 4.7.2	n/a	c5	[8N] 4.7.2	n/a	c6
5	application/EmergencyCallData.eCall.MSD	[244] 14.3	m	c7	[244] 14.3	m	c8
c1: IF A.3/6 OR A.3/7A OR A.3/7B OR A.3/7D OR A.3/9B OR A.3/13B THEN o ELSE n/a – – MGCF, AS acting as terminating UA, or redirect server, AS acting as originating UA, AS performing 3rd party call control, IBCF (IMS-ALG), ISC gateway function (IMS-ALG). c2: IF A.3A/92A OR A.3A/93B OR A.3/9 OR A.3/2 OR A.3A/89 THEN m ELSE n/a – – USSI UE supporting user-initiated USSD operations, USSI AS supporting network-initiated USSD operations, IBCF, P-CSCF, ATCF (UA). c3: IF A.3A/93A OR A.3A/92B OR A.3/9 OR A.3/2 OR A.3A/89 THEN m ELSE n/a – – USSI AS supporting user-initiated USSD operations, USSI UE supporting network-initiated USSD operations, IBCF, P-CSCF, ATCF (UA). c4: IF A.3A/102 OR A.3A/103 THEN m ELSE n/a – – MCPTT client, MCPTT server. c5 IF A.3A/53 THEN m ELSE n/a – – Advice of charge application server. c6 IF A.3A/54 THEN m ELSE n/a – – Advice of charge UA client. c7: IF (A.3/1 AND A.4/120) THEN m ELSE IF ((A.3/2A OR A.3/11A OR A.3A/84) AND A.4/120) THEN i ELSE n/a – – UE, Next-Generation Pan-European eCall emergency service, P-CSCF (IMS-ALG), E-CSCF acting as UA, EATF. c8: IF ((A.3/2A OR A.3/11A OR A.3A/84 OR A.3/12) AND A.4/120) THEN i ELSE n/a – – P-CSCF (IMS-ALG), E-CSCF acting as UA, EATF, LRF, Next-Generation Pan-European eCall emergency service.

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/1 – – Additional for 100 (Trying) response

Table A.48: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
6	To	[26] 20.39	m	m	[26] 20.39	m	m
7	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses.

Prerequisite A.5/9 – – INVITE response for all remaining status-codes

Table A.49: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Allow	[26] 20.5	c12	c12	[26] 20.5	m	m
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
1A	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
1B	Cellular-Network-Info	7.2.15	n/a	c20	7.2.15	n/a	c21
2	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
3	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
3A	Content-ID	[256] 3.2	o	c23	[256] 3.2	m	c24
4	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
5	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
6	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
7	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
8	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
8ª	Expires	[26] 20.19	o	o	[26] 20.19	o	o
9	From	[26] 20.20	m	m	[26] 20.20	m	m
9A	Geolocation-Error	[89] 4.3	c14	c14	[89] 4.3	c14	c14
9B	History-Info	[66] 4.1	c13	c13	[66] 4.1	c13	c13
10	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
11	Organization	[26] 20.25	o	o	[26] 20.25	o	o
11A	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c5	c6	[52] 4.4, [52A] 4, [234] 2	c5	c7
11B	P-Asserted-Identity	[34] 9.1	n/a	c22	[34] 9.1	c3	c3
11C	P-Charging-Function-Addresses	[52] 4.5, [52A] 4	c10	c11	[52] 4.5, [52A] 4	c11	c11
11D	P-Charging-Vector	[52] 4.6, [52A] 4	c8	c9	[52] 4.6, [52A] 4	c8	c9
11F	P-Preferred-Identity	[34] 9.2	c3	x	[34] 9.2	n/a	n/a
11G	Privacy	[33] 4.2	c4	c4	[33] 4.2	c4	c4
11H	Relayed-Charge	7.2.12	n/a	c19	7.2.12	n/a	c19
11I	Reply-To	[26] 20.31	o	o	[26] 20.31	o	o
11J	Require	[26] 20.32	m	m	[26] 20.32	m	m
11K	Server	[26] 20.35	o	o	[26] 20.35	o	o
11LA	Service-Interact-Info	Subclause 7.2.14	n/a	c25	Subclause 7.2.14	n/a	c26
11L	Session-ID	[162]	o	c18	[162]	o	c18
12	Timestamp	[26] 20.38	m	m	[26] 20.38	c2	c2
13	To	[26] 20.39	m	m	[26] 20.39	m	m
13A	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
13B	User-to-User	[126] 7	c15	c15	[126] 7	c15	c15
14	Via	[26] 20.42	m	m	[26] 20.42	m	m
15	Warning	[26] 20.43	o (note)	o	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c3: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c4: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c5: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c6: IF A.4/34 AND (A.3/1 OR A.3/2A OR A.3/7 OR A.3A/81 OR A.3/81A OR A.3A/81B) THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE, P-CSCF (IMS-ALG), AS or MSC server enhanced for ICS or MSC Server enhanced for SRVCC using SIP interface, MSC server enhanced for DRVCC using SIP interface. c7: IF A.4/34 AND (A.3/2A OR A.3A/81 OR A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the P-Access-Network-Info header extension and P-CSCF (IMS-ALG), MSC server enhanced for ICS, AS acting as terminating UA, AS acting as third-party call controller or EATF. c8: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c9: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c10: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c11: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c12: IF A.6/102 OR A.6/18 THEN m ELSE o – – 2xx response, 405 (Method Not Allowed). c13: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c14: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c15: IF A.4/76 THEN o ELSE n/a – – transporting user to user information for call centers using SIP. c18: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c19: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c20: IF A.4/113 AND (A.3/1 OR A.3/2A OR A.3/7) THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE, P-CSCF (IMS-ALG) or AS. c21: IF A.4/113 AND (A.3/2A OR A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the Cellular-Network-Info header extension and P-CSCF (IMS-ALG), AS acting as terminating UA, AS acting as third-party call controller or EATF. c22: IF A.4/25 AND (A.3/6 OR A.3/7B OR A.3/8 OR A.3A/81 OR A.3A/81A OR A.3A/81B OR A.3A/83 OR A.3A/89) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and MGCF, AS acting as originating UA, MRFC, MSC Server enhanced for ICS, MSC server enhanced for SRVCC using SIP interface, MSC server enhanced for DRVCC using SIP interface, SCC application server, ATCF (UA). c23: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c24: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c25: IF A.4/123 AND (A.3/7 OR A.3/9) THEN m ELSE n/a – – Dynamic services interactions, AS, IBCF. c26: IF A.4/123 AND (A.3/2 OR A.3/7 OR A.3/9) THEN m ELSE n/a – – Dynamic services interactions, P-CSCF, AS, IBCF.
NOTE: For a 488 (Not Acceptable Here) response, RFC 3261 [26] gives the status of this header as SHOULD rather than OPTIONAL.

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/101A – – Additional for 18x response

Table A.50: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Contact	[26] 20.10	o	m	[26] 20.10	m	m
4A	Feature-Caps	[190]	c17	c17	[190]	c16	c16
5	P-Answer-State	[111]	c13	c13	[111]	c13	c13
5A	P-Early-Media	[109] 8	c14	c14	[109] 8	c14	c14
6	P-Media-Authorization	[31] 5.1	n/a	n/a	[31] 5.1	c11	c12
6AA	Priority-Share	Subclause 7.2.16	n/a	c19	Subclause 7.2.16	n/a	c19
6A	Reason	[130], [294]	o	c15	[130], [294]	o	c15
7	Record-Route	[26] 20.30	o	m	[26] 20.30	m	m
8	Recv-Info	[25] 5.2.3	c4	c4	[25] 5.2.3	c4	c4
8A	Resource-Share	Subclause 7.2.13	n/a	c18	Subclause 7.2.13	n/a	c18
9	RSeq	[27] 7.1	c2	m	[27] 7.1	c3	m
c2: IF A.4/14 THEN o ELSE n/a – – reliability of provisional responses in SIP. c3: IF A.4/14 THEN m ELSE n/a – – reliability of provisional responses in SIP. c4: IF A.4/13 THEN m ELSE IF A.4/13A THEN m ELSE n/a – – SIP INFO method and package framework, legacy INFO usage. c11: IF A.4/19 THEN m ELSE n/a – – SIP extensions for media authorization. c12: IF A.3/1 AND A.4/19 THEN m ELSE n/a – – UE, SIP extensions for media authorization. c13: IF A.4/65 THEN m ELSE n/a – – the P-Answer-State header extension to the session initiation protocol for the open mobile alliance push to talk over cellular. c14: IF A.4/66 THEN m ELSE n/a – – the SIP P-Early-Media private header extension for authorization of early media. c15: IF A.4/38A OR A.4/38C THEN o ELSE n/a – – use of the Reason header field in Session Initiation Protocol (SIP) responses (carrying Q.850 or STIR codes). c16: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c17: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network. c18: IF A.4/112 THEN o ELSE n/a – – resource sharing. c19: IF A.4/114THEN o ELSE n/a – – priority sharing.

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/2 – – Additional for 180 (Ringing) response

Table A.50A: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Alert-Info	[26] 20.4	o	c1	[26] 20.4	o	c1
c1: IF A.4/96 THEN m ELSE o – – Alert-Info URNs for the Session Initiation Protocol.

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/5A – – Additional for 199 (Early Dialog Terminated) response

Table A.50B: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Contact	[26] 20.10	o	m	[26] 20.10	m	m
5	Reason	[130], [294]	o	c5	[130], [294]	o	c5
7	Record-Route	[26] 20.30	o	m	[26] 20.30	m	m
8	Recv-Info	[25] 5.2.3	c4	c4	[25] 5.2.3	c4	c4
9	RSeq	[27] 7.1	c2	m	[27] 7.1	c3	m
c2: IF A.4/14 THEN o ELSE n/a – – reliability of provisional responses in SIP. c3: IF A.4/14 THEN m ELSE n/a – – reliability of provisional responses in SIP. c4: IF A.4/13 THEN m ELSE IF A.4/13A THEN m ELSE n/a – – SIP INFO method and package framework, legacy INFO usage. c5: IF A.4/38A OR A.4/38C THEN o ELSE n/a – – use of the Reason header field in Session Initiation Protocol (SIP) responses (carrying Q.850 or STIR codes).

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.51: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o	o	[26] 20.1	m	m
1A	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
1B	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
1C	Accept-Resource-Priority	[116] 3.2	c15	c15	[116] 3.2	c15	c15
2	Allow-Events	[28] 8.2.2	c3	c3	[28] 8.2.2	c4	c4
3	Answer-Mode	[158]	c6	c6	[158]	c7	c7
4	Authentication-Info	[26] 20.6	c1	c1	[26] 20.6	c2	c2
6	Contact	[26] 20.10	m	m	[26] 20.10	m	m
6A	Feature-Caps	[190]	c18	c18	[190]	c17	c17
7	P-Answer-State	[111]	c14	c14	[111]	c14	c14
8	P-Media-Authorization	[31] 5.1	n/a	n/a	[31] 5.1	c11	c12
8AA	Priority-Share	Subclause 7.2.16	n/a	c20	Subclause 7.2.16	n/a	c20
8A	Priv-Answer-Mode	[158]	c6	c6	[158]	c7	c7
8B	Reason	[294]	o	c21	[294]	o	c21
9	Record-Route	[26] 20.30	m	m	[26] 20.30	m	m
9A	Recv-Info	[25] 5.2.3	c5	c5	[25] 5.2.3	c5	c5
9B	Resource-Share	Subclause 7.2.13	n/a	c19	Subclause 7.2.13	n/a	c19
10	Session-Expires	[58] 4	c13	c13	[58] 4	c13	c13
13	Supported	[26] 20.37	m	m	[26] 20.37	m	m
c1: IF A.4/7 THEN o ELSE n/a – – authentication between UA and UA. c2: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c3: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c4: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c5: IF A.4/13 THEN m ELSE IF A.4/13A THEN m ELSE n/a – – SIP INFO method and package framework, legacy INFO usage. c6 IF A.4/87 THEN o ELSE n/a – – requesting answering modes for SIP. c7 IF A.4/87 THEN m ELSE n/a – – requesting answering modes for SIP. c11: IF A.4/19 THEN m ELSE n/a – – SIP extensions for media authorization. c12: IF A.3/1 AND A.4/19 THEN m ELSE n/a – – UE, SIP extensions for media authorization. c13: IF A.4/42 THEN m ELSE n/a – – the SIP session timer. c14: IF A.4/65 THEN m ELSE n/a – – the P-Answer-State header extension to the session initiation protocol for the open mobile alliance push to talk over cellular. c15: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol. c17: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c18: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network. c19: IF A.4/112 THEN m ELSE n/a – – resource sharing. c20: IF A.4/114THEN o ELSE n/a – – priority sharing. c21: IF A.4/38C THEN o ELSE n/a – – use of the Reason header field in Session Initiation Protocol (SIP) responses (carrying STIR codes).

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.51A: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	o
2	Reason	[130], [294]	o	c1	[130], [294]	o	c1
3	Response-Source	7.2.17	n/a	c2	7.2.17	n/a	c2
c1: IF A.4/38A OR A.4/38C THEN o ELSE n/a – – use of the Reason header field in Session Initiation Protocol (SIP) responses (carrying Q.850 or STIR codes). c2: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses?

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/103 OR A.6/35 – – Additional for 3xx or 485 (Ambiguous) response

Table A.52: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Contact	[26] 20.10	o (note 1)	o	[26] 20.10	m	m
NOTE: The strength of this requirement is RECOMMENDED rather than OPTIONAL.

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/14 – – Additional for 401 (Unauthorized) response

Table A.53: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
6	Proxy-Authenticate	[26] 20.27	c3	c3	[26] 20.27	c3	c3
13	WWW-Authenticate	[26] 20.44	m	m	[26] 20.44	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c3: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/16 – – Additional for 403 (Forbidden) response

Table A.53A: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	P-Refused-URI-List	[183]	c1	c1	[183]	c1	c1
c1: IF A.4/98 THEN m ELSE n/a — The SIP P-Refused-URI-List private-header.

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/17 OR A.6/23 OR A.6/30 OR A.6/36 OR A.6/50 OR A.6/51 – – Additional for 404 (Not Found), 413 (Request Entity Too Large), 480(Temporarily not available), 486 (Busy Here), 500 (Internal Server Error), 600 (Busy Everywhere), 603 (Decline) response

Table A.54: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
8	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.55: Void

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/20 – – Additional for 407 (Proxy Authentication Required) response

Table A.56: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
6	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
11	WWW-Authenticate	[26] 20.44	o	o	[26] 20.44	o	o
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/21 – – Additional for 408 (Request timeout) response

Table A.56A: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Restoration-Info	subclause 7.2.11	n/a	c1	subclause 7.2.11	n/a	n/a
c1: IF A.4/110 THEN o ELSE n/a – – HSS based P-CSCF restoration.

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/25 – – Additional for 415 (Unsupported Media Type) response

Table A.57: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o.1	o.1	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o.1	o.1	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o.1	o.1	[26] 20.3	m	m
o.1 At least one of these capabilities is supported.

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.57A: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol.

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/27 – – Additional for 420 (Bad Extension) response

Table A.58: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
10	Unsupported	[26] 20.40	m	m	[26] 20.40	m	m

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/28 OR A.6/41A – – Additional for 421 (Extension Required), 494 (Security Agreement Required) response

Table A.58A: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Security-Server	[48] 2	x	x	[48] 2	c1	c1
c1: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol.

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/28A – – Additional for 422 (Session Interval Too Small) response

Table A.58B: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Min-SE	[58] 5	c1	c1	[58] 5	c1	c1
c1: IF A.4/42 THEN o ELSE n/a – – the SIP session timer.

Table A.59: Void

Table A.60: Void

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/29H – – Additional for 470 (Consent Needed) response

Table A.60A: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Permission-Missing	[125] 5.9.3	m	m	[125] 5.9.3	m	m

Prerequisite A.5/9 – – INVITE response

Prerequisite: A.6/45 – – 503 (Service Unavailable)

Table A.61: Supported header fields within the INVITE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
8	Retry-After	[26] 20.33	o	o	[26] 20.33	o	m

Table A.61A: Void

Prerequisite A.5/9 – – INVITE response

Table A.62: Supported message bodies within the INVITE response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	XML Schema for PSTN	[11B]		c1	[11B]		c1
2	Recipient list	[183]	c2	c2	[183]	c2	c2
3	3GPP IM CN subsystem XML body	subclause 7.6	n/a	c3	subclause 7.6	n/a	c4 (note)
4	application/vnd.3gpp.mcptt-info+xml	[8ZE]	n/a	c5	[8ZE]	n/a	c5
5	application/vnd.etsi.aoc+xml	[8N] 4.7.2	n/a	c6	[8N] 4.7.2	n/a	c7
6	application/EmergencyCallData.Control+xml	[244] 14.4	m	c8	[244] 14.4	m	c9
c1: IF A.3/6 OR A.3/7A OR A.3/7B OR A.3/7D OR A.3/9B OR A.3/13B THEN o ELSE n/a – – MGCF, AS acting as terminating UA, or redirect server, AS acting as originating UA, AS performing 3rd party call control, IBCF (IMS-ALG), ISC gateway function (IMS-ALG). c2: IF A.3/9B OR A.3/13B THEN m ELSE IF A.3/7A OR A.3/7B OR A.3/7D THEN o ELSE n/a – – IBCF (IMS-ALG), ISC gateway function (IMS-ALG), AS acting as terminating UA, AS acting as originating UA, AS performing 3^rd party call control. c3: IF A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C OR (A.4/103 AND A.3/2) OR (A.4/103 AND A.3/4) THEN m ELSE n/a – – IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), S-CSCF restoration procedures, P-CSCF, S-CSCF. c4: IF A.3/1 OR A.3/2 OR A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C THEN m ELSE IF A.3/4 THEN o ELSE n/a – – UE, P-CSCF, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), S-CSCF. c5: IF A.3A/102 OR A.3A/103 THEN M ELSE n/a – – MCPTT client, MCPTT server. c6 IF A.3A/53 THEN m ELSE n/a – – Advice of charge application server. c7 IF A.3A/54 THEN m ELSE n/a – – Advice of charge UA client. c8: IF ((A.3/2A OR A.3/11A OR A.3A/84) AND A.4/120) THEN i ELSE n/a – – P-CSCF (IMS-ALG), E-CSCF acting as UA, EATF, Next-Generation Pan-European eCall emergency service. c9: IF (A.3/1 AND A.4/120) THEN m ELSE IF ((A.3/2A OR A.3/11A OR A.3A/84) AND A.4/120) THEN i ELSE n/a – – UE, Next-Generation Pan-European eCall emergency service, P-CSCF (IMS-ALG), E-CSCF acting as UA, EATF.
NOTE: If a IBCF (IMS-ALG) or a IBCF (Screening of SIP signalling) is unable to receive a 3GPP IM CN subsystem XML body from a S-CSCF in a serving network then the IBCF (IMS-ALG) or the IBCF (Screening of SIP signalling) support can be "o" instead of "m". Examples include an S-CSCF supporting S-CSCF restoration procedures.

A.2.1.4.7A MESSAGE method

Prerequisite A.5/9A – – MESSAGE request

Table A.62A: Supported header fields within the MESSAGE request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Contact	[56B] 9.2	c24	c24	[56B] 9.2	c28	c28
1AA	Additional-Identity	7.2.20	n/a	c58	7.2.20	n/a	c59
1A	Allow	[26] 20.5	o	o	[26] 20.5	m	m
2	Allow-Events	[28] 8.2.2	c1	c1	[28] 8.2.2	c2	c2
2A	Attestation-Info	7.2.18	n/a	c54	7.2.18	n/a	c54
3	Authorization	[26] 20.7	c3	c3	[26] 20.7	c3	c3
4	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
5	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
5A	Cellular-Network-Info	7.2.15	n/a	c47	7.2.15	n/a	c48
6	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
7	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
7A	Content-ID	[256] 3.2	o	c52	[256] 3.2	m	c53
8	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
9	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
10	Content-Type	[26] 20.15	m	m	[26] 29.15	m	m
11	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
12	Date	[26] 20.17	c4	c4	[26] 20.17	m	m
13	Expires	[26] 20.19	o	o	[26] 20.19	o	o
13A	Feature-Caps	[190]	c45	c45	[190]	c44	c44
14	From	[26] 20.20	m	m	[26] 20.20	m	m
14A	Geolocation	[89] 4.1	c29	c29	[89] 4.1	c29	c29
14B	Geolocation-Routing	[89] 4.2	c29	c29	[89] 4.2	c29	c29
14C	History-Info	[66] 4.1	c27	c27	[66] 4.1	c27	c27
14D	Identity	[252] 4	c51	c51	[252] 4	c51	c51
15	In-Reply-To	[26] 20.21	o	o	[26] 20.21	o	o
15A	Max-Breadth	[117] 5.8	n/a	c39	[117] 5.8	c40	c40
16	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c42
17	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
18	Organization	[26] 20.25	o	o	[26] 20.25	o	o
18AA	Origination-Id	7.2.19	n/a	c55	7.2.19	n/a	c55
18A	P-Access-Network-Info	[52] 4.4, [234] 2	c15	c16	[52] 4.4, [234] 2	c15	c16
18B	P-Asserted-Identity	[34] 9.1	n/a	c49	[34] 9.1	c11	c11
18C	P-Asserted-Service	[121] 4.1	n/a	c50	[121] 4.1	c33	c33
18D	P-Called-Party-ID	[52] 4.2	x	x	[52] 4.2	c13	c13
18E	P-Charging-Function-Addresses	[52] 4.5	c20	c21	[52] 4.5	c20	c21
18F	P-Charging-Vector	[52] 4.6	c18	c19	[52] 4.6	c18	c19
18H	P-Preferred-Identity	[34] 9.2	c11	c7	[34] 9.2	n/a	n/a
18I	P-Preferred-Service	[121] 4.2	c32	c31	[121] 4.2	n/a	n/a
18J	P-Private-Network-Indication	[134]	c36	c36	[134]	c36	c36
18K	P-Profile-Key	[97] 5	n/a	n/a	[97] 5	n/a	n/a
18L	P-Served-User	[133] 6	c41	c41	[133] 6	c41	c41
18M	P-User-Database	[82] 4	n/a	n/a	[82] 4	n/a	n/a
18N	P-Visited-Network-ID	[52] 4.3	x (note 1)	x	[52] 4.3	c14	n/a
19	Priority	[26] 20.26	o	o	[26] 20.26	o	o
19A	Privacy	[33] 4.2	c12	c12	[33] 4.2	c12	c12

20	Proxy-Authorization	[26] 20.28	c5	c5	[26] 20.28	n/a	n/a
21	Proxy-Require	[26] 20.29	o	n/a	[26] 20.29	n/a	n/a
21A	Reason	[34A] 2	c6	c6	[34A] 2	c6	c6
22A	Referred-By	[59] 3	c25	c25	[59] 3	c26	c26
23	Reject-Contact	[56B] 9.2	c24	c24	[56B] 9.2	c28	c28
23A	Relayed-Charge	7.2.12	n/a	c46	7.2.12	n/a	c46
23B	Reply-To	[26] 20.31	o	o	[26] 20.31	o	o
23C	Request-Disposition	[56B] 9.1	c24	c24	[56B] 9.1	c28	c28
24	Require	[26] 20.32	m	m	[26] 20.32	m	m
24A	Resource-Priority	[116] 3.1	c30	c30	[116] 3.1	c30	c30
25	Route	[26] 20.34	m	m	[26] 20.34	n/a	n/a
25A	Security-Client	[48] 2.3.1	c22	c22	[48] 2.3.1	n/a	n/a
25B	Security-Verify	[48] 2.3.1	c23	c23	[48] 2.3.1	n/a	n/a
25CA	Service-Interact-Info	Subclause 7.2.14	n/a	c56	Subclause 7.2.14	n/a	c57
25C	Session-ID	[162]	o	c43	[162]	o	c43
26	Subject	[26] 20.35	o	o	[26] 20.36	o	o
27	Supported	[26] 20.37	c9	m	[26] 20.37	m	m
28	Timestamp	[26] 20.38	c10	c10	[26] 20.38	m	m
29	To	[26] 20.39	m	m	[26] 20.39	m	m
29A	Trigger-Consent	[125] 5.11.2	c34	c34	[125] 5.11.2	c35	c35
30	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
31	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c2: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c3: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c4: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c5: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c6: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c7: IF A.3/1 AND A.4/25 THEN o ELSE n/a – – UE and private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c9: IF A.4/14 THEN m ELSE o – – support of reliable transport. c10: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c11: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c12: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c13: IF A.4/32 THEN o ELSE n/a – – the P-Called-Party-ID extension. c14: IF A.4/33 THEN o ELSE n/a – – the P-Visited-Network-ID extension. c15: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c16: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c17: IF A.4/34 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c18: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c19: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c20: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c21: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c22: IF A.4/37 OR A.4/37A THEN o ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media (note 2). c23: IF A.4/37 OR A.4/37A THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media. c24: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c25: IF A.4/43 THEN m ELSE n/a – – the SIP Referred-By mechanism. c26: IF A.4/43 THEN o ELSE n/a – – the SIP Referred-By mechanism. c27: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c28: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c29: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c30: IF A.4/70A THEN m ELSE n/a – – inclusion of MESSAGE, SUBSCRIBE, NOTIFY in communications resource priority for the session initiation protocol. c31: IF A.3/1 AND A.4/74 THEN o ELSE n/a – – UE and SIP extension for the identification of services. c32: IF A.4/74 THEN o ELSE n/a – – SIP extension for the identification of services. c33: IF A.4/74 THEN m ELSE n/a – – SIP extension for the identification of services. c34: IF A.4/75A THEN m ELSE n/a – – a relay within the framework for consent-based communications in SIP. c35: IF A.4/75B THEN m ELSE n/a – – a recipient within the framework for consent-based communications in SIP. c36: IF A.4/77 THEN m ELSE n/a – – the SIP P-Private-Network-Indication private-header (P-Header). c39: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), UE, UE performing the functions of an external attached network. c40: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c41: IF A.4/78 THEN m ELSE n/a – – the SIP P-Served-User private header. c42: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c43: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c44: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c45: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network. c46: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c47: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c48: IF A.4/113 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c49: IF A.4/25 AND (A.3/7B OR A.3/8) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and AS acting as originating UA, MRFC. c50: IF A.4/74 AND A.3/7B THEN o ELSE n/a – – SIP extension for the identification of services and AS acting as originating UA. c51: IF A.4/116 AND (A.3/7 OR A.3/9) THEN m ELSE n/a – – authenticated identity management in the Session Initiation Protocol, AS, IBCF. c52: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c53: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c54: IF A.4/121 AND (A.3/6 OR A.3/7 OR A.3/9) THEN m ELSE n/a – – the Attestation-Info header field extension, MGCF, AS, IBCF. c55: IF A.4/122 AND (A.3/6 OR A.3/7 OR A.3/9) THEN m ELSE n/a – – the Origination-Id header field extension, MGCF, AS, IBCF. c56: IF A.4/123 AND (A.3/7 OR A.3/9) THEN m ELSE n/a – – Dynamic services interactions, AS, IBCF. c57: IF A.4/123 AND (A.3/2 OR A.3/7 OR A.3/9) THEN m ELSE n/a – – Dynamic services interactions, P-CSCF, AS, IBCF. c58: IF A.4/124 THEN o ELSE n/a – – the Additional-Identity header field extension. c59: IF A.4/124 THEN m ELSE n/a – – the Additional-Identity header field extension.
NOTE 1: The strength of this requirement in RFC 7315 [52] is SHOULD NOT, rather than MUST NOT. NOTE 2: Support of this header in this method is dependent on the security mechanism and the security architecture which is implemented. Use of this header in this method is not appropriate to the security mechanism defined by 3GPP TS 33.203 [19].

Prerequisite A.5/9A – – MESSAGE request

Table A.62B: Supported message bodies within the MESSAGE request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	permission document	[125] 5.4	c1	c1	[125] 5.4	c2	c2
2	application/vnd.3gpp.sms	[4D]	c3	c3	[4D]	c3	c3
3	message/cpim	[151]	c4	c4	[151]	c4	c4
4	message/imdn+xml	[157]	c5	c5	[157]	c5	c5
5	application/vnd.3gpp.mcptt-info+xml	[8ZE]	n/a	c6	[8ZE]	n/a	c6
6	application/vnd.3gpp.mcptt-mbms-usage-info+xml	[8ZE]	n/a	c6	[8ZE]	n/a	c6
7	application/vnd.3gpp.mcptt-location-info+xml	[8ZE]	n/a	c6	[8ZE]	n/a	c6
8	application/vnd.3gpp.mcptt-floor-request+xml	[8ZE]	n/a	c7	[8ZE]	n/a	c7
9	application/vnd.3gpp.mcptt-affiliation-command+xml	[8ZE]	n/a	c6	[8ZE]	n/a	c6
c1: IF A.4/75A THEN m ELSE n/a – – a relay within the framework for consent-based communications in SIP. c2: IF A.4/75B THEN m ELSE n/a – – a recipient within the framework for consent-based communications in SIP. c3: IF A.3A/61 OR A.3A/62 OR A.3A/63 THEN m ELSE o – – an SM-over-IP sender or an SM-over-IP receiver or an IP-SM-GW for SMS over IP. c4: IF A.3A/71 AND A.4/85 THEN m ELSE n/a – – common presence and instant messaging (CPIM): message format. c5: IF A.3A/71 AND A.4/86 THEN m ELSE n/a – – instant message disposition notification. c6: IF A.3A/102 OR A.3A/103 THEN m ELSE n/a – – MCPTT client, MCPTT server. c7: IF A.3A/103 THEN m ELSE n/a – – MCPTT server.

Prerequisite A.5/9B – – MESSAGE response

Prerequisite: A.6/1 – – Additional for 100 (Trying) response

Table A.62BA: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
6	To	[26] 20.39	m	m	[26] 20.39	m	m
7	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses.

Prerequisite A.5/9B – – MESSAGE response for all remaining status-codes

Table A.62C: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Allow	[26] 20.5	c12	c12	[26] 20.5	m	m
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
2A	Cellular-Network-Info	7.2.15	n/a	c19	7.2.15	n/a	c20
3	Content-Disposition	[26] 20.11	o (note 1)	o (note 1)	[26] 20.11	m (note 1)	m (note 1)
4	Content-Encoding	[26] 20.12	o (note 1)	o (note 1)	[26] 20.12	m (note 1)	m (note 1)
4A	Content-ID	[256] 3.2	o	c22	[256] 3.2	m	c23
5	Content-Language	[26] 20.13	o (note 1)	o (note 1)	[26] 20.13	m (note 1)	m (note 1)
6	Content-Length	[26] 20.14	m (note 1)	m (note 1)	[26] 20.14	m (note 1)	m (note 1)
7	Content-Type	[26] 20.15	m (note 1)	m (note 1)	[26] 20.15	m (note 1)	m (note 1)
8	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
9	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
9A	Expires	[26] 20.19	o	o	[26] 20.19	o	o
10	From	[26] 20.20	m	m	[26] 20.20	m	m
10A	Geolocation-Error	[89] 4.3	c14	c14	[89] 4.3	c14	c14
10B	History-Info	[66] 4.1	c13	c13	[66] 4.1	c13	c13
11	MIME-Version	[26] 20.24	o (note 1)	o (note 1)	[26] 20.24	m (note 1)	m (note 1)
12	Organization	[26] 20.25	o	o	[26] 20.25	o	o
12A	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c5	c6	[52] 4.4, [52A] 4, [234] 2	c5	c7
12B	P-Asserted-Identity	[34] 9.1	n/a	c21	[34] 9.1	c3	c3
12C	P-Charging-Function-Addresses	[52] 4.5, [52A] 4	c10	c11	[52] 4.5, [52A] 4	c10	c11
12D	P-Charging-Vector	[52] 4.6, [52A] 4	c8	c9	[52] 4.6, [52A] 4	c8	c9
12F	P-Preferred-Identity	[34] 9.2	c3	x	[34] 9.2	n/a	n/a
12G	Privacy	[33] 4.2	c4	c4	[33] 4.2	c4	c4
12H	Relayed-Charge	7.2.12	n/a	c18	7.2.12	n/a	c18
12I	Reply-To	[26] 20.31	o	o	[26] 20.31	o	o
12J	Require	[26] 20.32	m	m	[26] 20.32	m	m
13	Server	[26] 20.35	o	o	[26] 20.35	o	o
13AA	Service-Interact-Info	Subclause 7.2.14	n/a	c24	Subclause 7.2.14	n/a	c25
13A	Session-ID	[162]	o	c17	[162]	o	c17
14	Timestamp	[26] 20.38	m	m	[26] 20.38	c2	c2
15	To	[26] 20.39	m	m	[26] 20.39	m	m
16	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
17	Via	[26] 20.42	m	m	[26] 20.42	m	m
18	Warning	[26] 20.43	o	o	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c3: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c4: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c5: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c6: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c7: IF A.4/34 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c8: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c9: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c10: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c11: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c12: IF A.6/18 THEN m ELSE o – – 405 (Method Not Allowed). c13: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c14: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c17: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c18: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c19: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c20: IF A.4/113 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c21: IF A.4/25 AND (A.3/7B OR A.3/8 OR A.3A/83 OR A.3A/89) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and AS acting as originating UA, MRFC, SCC application server, ATCF (UA). c22: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c23: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c24: IF A.4/123 AND (A.3/7 OR A.3/9) THEN m ELSE n/a – – Dynamic services interactions, AS, IBCF. c25: IF A.4/123 AND (A.3/2 OR A.3/7 OR A.3/9) THEN m ELSE n/a – – Dynamic services interactions, P-CSCF, AS, IBCF.
NOTE 1: RFC 3428 [50] clause 7 states that all 2xx class responses to a MESSAGE request must not include any body, therefore for 2xx responses to the MESSAGE request the values on Sending side for "RFC status" and "Profile status" are "x", the values for Receiving side for "RFC status" and "Profile Status" are "n/a". RFC 3261 [26] subclause 7.4 states that all responses may contain bodies, therefore for all responses to the MESSAGE request other than 2xx responses, the values on Sending side for "RFC status" and "Profile status" are "o", the values for Receiving side for "RFC status" and "Profile Status" are "m".

Prerequisite A.5/9B – – MESSAGE response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.62D: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Accept-Resource-Priority	[116] 3.2	c5	c5	[116] 3.2	c5	c5
1	Allow-Events	[28] 8.2.2	c3	c3	[28] 8.2.2	c4	c4
2	Authentication-Info	[26] 20.6	c1	c1	[26] 20.6	c2	c2
3	Feature-Caps	[190]	c8	c8	[190]	c7	c7
3A	Reason	[294]	o	c9	[294]	o	c9
6	Supported	[26] 20.37	o	o	[26] 20.37	m	m
c1: IF A.4/7 THEN o ELSE n/a – – authentication between UA and UA. c2: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c3: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c4: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c5: IF A.4/70A THEN m ELSE n/a – – inclusion of MESSAGE, SUBSCRIBE, NOTIFY in communications resource priority for the session initiation protocol. c7: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c8: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network. c9: IF A.4/38C THEN o ELSE n/a – – use of the Reason header field in Session Initiation Protocol (SIP) responses (carrying STIR codes).

Prerequisite A.5/9B – – MESSAGE response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.62DA: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	o
1A	Reason	[294]	o	c2	[294]	o	c2
2	Response-Source	7.2.17	n/a	c1	7.2.17	n/a	c1
c1: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses? c2: IF A.4/38C THEN o ELSE n/a – – use of the Reason header field in Session Initiation Protocol (SIP) responses (carrying STIR codes).

Prerequisite A.5/9B – – MESSAGE response

Prerequisite: A.6/103 – – Additional for 3xx or 485 (Ambiguous) response

Table A.62E: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
2	Contact	[26] 20.10	o (note)	o	[26] 20.10	m	m
NOTE: The strength of this requirement is RECOMMENDED rather than OPTIONAL.

Prerequisite A.5/9B – – MESSAGE response

Prerequisite: A.6/14 – – Additional for 401 (Unauthorized) response

Table A.62F: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
6	WWW-Authenticate	[26] 20.44	m	m	[26] 20.44	m	m
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/9B – – MESSAGE response

Table A.62G: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.62H: Void

Prerequisite A.5/9B – – MESSAGE response

Prerequisite: A.6/20 – – Additional for 407 (Proxy Authentication Required) response

Table A.62I: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
6	WWW-Authenticate	[26] 20.44	o	o	[26] 20.44	o	o
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Table A.62IA: Void

Prerequisite A.5/9B – – MESSAGE response

Prerequisite: A.6/25 – – Additional for 415 (Unsupported Media Type) response

Table A.62J: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o.1	o.1	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o.1	o.1	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o.1	o.1	[26] 20.3	m	m
o.1 At least one of these capabilities is supported.

Prerequisite A.5/9B – – MESSAGE response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.62JA: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70A THEN m ELSE n/a – – inclusion of MESSAGE, SUBSCRIBE, NOTIFY in communications resource priority for the session initiation protocol.

Prerequisite A.5/9B – – MESSAGE response

Prerequisite: A.6/27 – – Additional for 420 (Bad Extension) response

Table A.62K: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
5	Unsupported	[26] 20.40	m	m	[26] 20.40	m	m

Prerequisite A.5/9B – – MESSAGE response

Prerequisite: A.6/28 OR A.6/41A – – Additional for 421 (Extension Required), 494 (Security Agreement Required) response

Table A.62L: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Security-Server	[48] 2	x	x	[48] 2	c1	c1
c1: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol.

Table A.62M: Void

Prerequisite A.5/9B – – MESSAGE response

Prerequisite: A.6/29H – – Additional for 470 (Consent Needed) response

Table A.62MA: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Permission-Missing	[125] 5.9.3	m	m	[125] 5.9.3	m	m

Prerequisite A.5/9B – – MESSAGE response

Prerequisite: A.6/46 – – Additional for 504 (Server Time-out) response

Table A.62MB: Supported header fields within the MESSAGE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Restoration-Info	subclause 7.2.11	n/a	c1	subclause 7.2.11	n/a	n/a
c1: IF A.4/110 THEN o ELSE n/a – – HSS based P-CSCF restoration.

Prerequisite A.5/9B – – MESSAGE response

Table A.62N: Supported message bodies within the MESSAGE response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

A.2.1.4.8 NOTIFY method

Prerequisite A.5/10 – – NOTIFY request

Table A.63: Supported header fields within the NOTIFY request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o	o	[26] 20.1	m	m
1A	Accept-Contact	[56B] 9.2	c19	c19	[56B] 9.2	c23	c23
2	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
3A	Allow	[26] 20.5	o	o	[26] 20.5	m	m
4	Allow-Events	[28] 8.2.2	c1	c1	[28] 8.2.2	c2	c2
5	Authorization	[26] 20.7	c3	c3	[26] 20.7	c3	c3
6	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
6A	Call-Info	[26] 20.9	o	o	[26] 20.9	c25	c25
6B	Cellular-Network-Info	7.2.15	n/a	c38	7.2.15	n/a	c39
6C	Contact	[26] 20.10	m	m	[26] 20.10	m	m
7	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
8	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
8A	Content-ID	[256] 3.2	o	c41	[256] 3.2	m	c42
9	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
10	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
11	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
12	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
13	Date	[26] 20.17	c4	c4	[26] 20.17	m	m
14	Event	[28] 8.2.1	m	m	[28] 8.2.1	m	m
14A	Feature-Caps	[190]	c35	c35	[190]	c34	c34
15	From	[26] 20.20	m	m	[26] 20.20	m	m
15A	Geolocation	[89] 4.1	c24	c24	[89] 4.1	c24	c24
15B	Geolocation-Routing	[89] 4.2	c24	c24	[89] 4.2	c24	c24
15C	History-Info	[66] 4.1	c22	c22	[66] 4.1	c22	c22
15D	Max-Breadth	[117] 5.8	n/a	c26	[117] 5.8	c27	c27
16	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c32
17	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
17A	P-Access-Network-Info	[52] 4.4, [234] 2	c10	c11	[52] 4.4, [234] 2	c10	c12
17B	P-Asserted-Identity	[34] 9.1	n/a	c40	[34] 9.1	c6	c6
17C	P-Charging-Function-Addresses	[52] 4.5	c14	c15	[52] 4.5	c14	c15
17D	P-Charging-Vector	[52] 4.6	c13	c36	[52] 4.6	c13	c36
17F	P-Preferred-Identity	[34] 9.2	c6	x	[34] 9.2	n/a	n/a
17G	Privacy	[33] 4.2	c7	n/a	[33] 4.2	c7	c7
18	Proxy-Authorization	[26] 20.28	c5	c5	[26] 20.28	n/a	n/a
19	Proxy-Require	[26] 20.29	o	n/a	[26] 20.29	n/a	n/a
19A	Reason	[34A] 2	c18	c18	[34A] 2	c18	c18
20	Record-Route	[26] 20.30	n/a	c32	[26] 20.30	c9	c9
20A	Referred-By	[59] 3	c20	c20	[59] 3	c21	c21
20B	Reject-Contact	[56B] 9.2	c19	c19	[56B] 9.2	c23	c23
20C	Relayed-Charge	7.2.12	n/a	c37	7.2.12	n/a	c37
20D	Request-Disposition	[56B] 9.1	c19	c19	[56B] 9.1	c23	c23
21	Require	[26] 20.32	m	m	[26] 20.32	m	m
22A	Resource-Priority	[116] 3.1	c29	c29	[116] 3.1	c29	c29
22B	Security-Client	[48] 2.3.1	c16	c16	[48] 2.3.1	n/a	n/a
22C	Security-Verify	[48] 2.3.1	c17	c17	[48] 2.3.1	n/a	n/a
22D	Session-ID	[162]	o	c33	[162]	o	c33
22	Route	[26] 20.34	m	m	[26] 20.34	n/a	c32
23	Subscription-State	[28] 8.2.3	m	m	[28] 8.2.3	m	m
24	Supported	[26] 20.37	o	o	[26] 20.37	m	m
25	Timestamp	[26] 20.38	c8	c8	[26] 20.38	m	m
26	To	[26] 20.39	m	m	[26] 20.39	m	m
27	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
28	Via	[26] 20.42	m	m	[26] 20.42	m	m
29	Warning	[26] 20.43	o	o	[26] 20.43	o	o
c1: IF A.4/20 THEN o ELSE n/a – – SIP specific event notification extension. c2: IF A.4/20 THEN m ELSE n/a – – SIP specific event notification extension. c3: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c4: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c5: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c6: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c7: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c8: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c9: IF A.4/15 OR A.4/20 THEN m ELSE n/a – – the REFER method extension or SIP specific event notification extension. c10: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c11: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c12: IF A.4/34 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c13: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c14: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c15: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c16: IF A.4/37 OR A.4/37A THEN o ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media (note). c17: IF A.4/37 OR A.4/37A THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media. c18: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c19: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c20: IF A.4/43 THEN m ELSE n/a – – the SIP Referred-By mechanism. c21: IF A.4/43 THEN o ELSE n/a – – the SIP Referred-By mechanism. c22: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c23: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c24: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c25: IF A.4/63 THEN m ELSE o – – subscriptions to request-contained resource lists in the session initiation protocol. c26: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), UE, UE performing the functions of an external attached network. c27: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c29: IF A.4/70A THEN m ELSE n/a – – inclusion of MESSAGE, SUBSCRIBE, NOTIFY in communications resource priority for the session initiation protocol. c32:: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c33: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c34: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c35: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network. c36: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c37: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c38: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c39: IF A.4/113 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c40: IF A.4/25 AND (A.3/7B OR A.3/8) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and AS acting as originating UA, MRFC. c41: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c42: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE: Support of this header in this method is dependent on the security mechanism and the security architecture which is implemented. Use of this header in this method is not appropriate to the security mechanism defined by 3GPP TS 33.203 [19].

Prerequisite A.5/10 – – NOTIFY request

Table A.64: Supported message bodies within the NOTIFY request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	sipfrag	[37] 2	c1	c1	[37]	c1	c1
2	event package (see NOTE)	[28]	m	m	[28]	m	m
c1: IF A.4/15 THEN m ELSE o – – the REFER method extension
NOTE: The appropriate body specified for the supported event package (see table A.4A) is supported.

Prerequisite A.5/11 – – NOTIFY response

Prerequisite: A.6/1 – – Additional for 100 (Trying) response

Table A.64A: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
6	To	[26] 20.39	m	m	[26] 20.39	m	m
7	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses.

Prerequisite A.5/11 – – NOTIFY response for all remaining status-codes

Table A.65: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Allow	[26] 20.5	c11	c11	[26] 20.5	m	m
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
1A	Cellular-Network-Info	7.2.15	n/a	c18	7.2.15	n/a	c19
2	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
3	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
3A	Content-ID	[256] 3.2	o	c21	[256] 3.2	m	c22
4	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
5	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
6	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
7	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
8	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
9	From	[26] 20.20	m	m	[26] 20.20	m	m
9A	Geolocation-Error	[89] 4.3	c12	c12	[89] 4.3	c12	c12
10	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
10A	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c5	c6	[52] 4.4, [52A] 4, [234] 2	c5	c7
10B	P-Asserted-Identity	[34] 9.1	n/a	c20	[34] 9.1	c3	c3
10C	P-Charging-Function-Addresses	[52] 4.5, [52A] 4	c9	c10	[52] 4.5, [52A] 4	c9	c10
10D	P-Charging-Vector	[52] 4.6, [52A] 4	c8	c16	[52] 4.6, [52A] 4	c8	c16
10F	P-Preferred-Identity	[34] 9.2	c3	x	[34] 9.2	n/a	n/a
10G	Privacy	[33] 4.2	c4	n/a	[33] 4.2	c4	c4
10H	Relayed-Charge	7.2.12	n/a	c17	7.2.12	n/a	c17
10I	Require	[26] 20.32	m	m	[26] 20.32	m	m
10J	Server	[26] 20.35	o	o	[26] 20.35	o	o
10K	Session-ID	[162]	o	c15	[162]	o	c15
11	Timestamp	[26] 20.38	m	m	[26] 20.38	c2	c2
12	To	[26] 20.39	m	m	[26] 20.39	m	m
12A	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
13	Via	[26] 20.42	m	m	[26] 20.42	m	m
14	Warning	[26] 20.43	o (note)	o	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c3: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c4: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c5: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c6: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c7: IF A.4/34 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c8: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c9: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c10: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c11: IF A.6/18 THEN m ELSE o – – 405 (Method Not Allowed). c12: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c15: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c16: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c17: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c18: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c19: IF A.4/113 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c20: IF A.4/25 AND (A.3/7B OR A.3/8) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and AS acting as originating UA, MRFC. c21: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c22: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE: RFC 3261 [26] gives the status of this header as SHOULD rather than OPTIONAL.

Prerequisite A.5/11 – – NOTIFY response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.66: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Accept-Resource-Priority	[116] 3.2	c6	c6	[116] 3.2	c6	c6
0B	Allow-Events	[28] 8.2.2	c4	c4	[28] 8.2.2	c5	c5
1	Authentication-Info	[26] 20.6	c1	c1	[26] 20.6	c2	c2
1A	Contact	[26] 20.10	o	o	[26] 20.10	m	m
1B	Feature-Caps	[190]	c8	c8	[190]	c8	c8
2	Record-Route	[26] 20.30	c3	c3	[26] 20.30	c3	c3

5	Supported	[26] 20.37	m	m	[26] 20.37	m	m
c1: IF A.4/7 THEN o ELSE n/a – – authentication between UA and UA. c2: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c3: IF A.4/15 OR A.4/20 THEN m ELSE n/a – – the REFER method extension or SIP specific event notification extension. c4: IF A.4/20 THEN o ELSE n/a – – SIP specific event notification extension. c5: IF A.4/20 THEN m ELSE n/a – – SIP specific event notification extension. c6: IF A.4/70A THEN m ELSE n/a – – inclusion of MESSAGE, SUBSCRIBE, NOTIFY in communications resource priority for the session initiation protocol. c8: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy.

Prerequisite A.5/11 – – NOTIFY response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.66A: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	o
2	Response-Source	7.2.17	n/a	c1	7.2.17	n/a	c1
c1: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses?

Prerequisite A.5/11 – – NOTIFY response

Prerequisite: A.6/103 – – Additional for 3xx response

Table A.67: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Contact	[26] 20.10	m	m	[26] 20.10	m	m

Prerequisite A.5/11 – – NOTIFY response

Prerequisite: A.6/14 – – Additional for 401 (Unauthorized) response

Table A.68: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
2	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
8	WWW-Authenticate	[26] 20.44	m	m	[26] 20.44	m	m
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/11 – – NOTIFY response

Table A.69: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.70: Void

Table A.71: Void

Prerequisite A.5/11 – – NOTIFY response

Prerequisite: A.6/21 – – Additional for 408 (Request timeout) response

Table A.71A: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Restoration-Info	subclause 7.2.11	n/a	c1	subclause 7.2.11	n/a	n/a
c1: IF A.4/110 THEN o ELSE n/a – – HSS based P-CSCF restoration.

Prerequisite A.5/11 – – NOTIFY response

Prerequisite A.6/25 – – Additional for 415 (Unsupported Media Type) response

Table A.72: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o.1	o.1	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o.1	o.1	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o.1	o.1	[26] 20.3	m	m
o.1 At least one of these capabilities is supported.

Prerequisite A.5/11 – – NOTIFY response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.72A: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70A THEN m ELSE n/a – – inclusion of MESSAGE, SUBSCRIBE, NOTIFY in communications resource priority for the session initiation protocol.

Prerequisite A.5/11 – – NOTIFY response

Prerequisite: A.6/27 – – Addition for 420 (Bad Extension) response

Table A.73: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
5	Unsupported	[26] 20.40	m	m	[26] 20.40	m	m

Prerequisite A.5/11 – – NOTIFY response

Prerequisite: A.6/28 OR A.6/41A – – Additional for 421 (Extension Required), 494 (Security Agreement Required) response

Table A.73A: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Security-Server	[48] 2	x	x	[48] 2	c1	c1
c1: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol.

Table A.74: Void

Prerequisite A.5/11 – – NOTIFY response

Prerequisite: A.6/35 – – Additional for 485 (Ambigious) response

Table A.74A: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Contact	[26] 20.10	o	o	[26] 20.10	m	m

Prerequisite A.5/11 – – NOTIFY response

Prerequisite: A.6/39 – – Additional for 489 (Bad Event) response

Table A.75: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Allow-Events	[28] 8.2.2	m	m	[28] 8.2.2	m	m

Prerequisite A.5/11 – – NOTIFY response

Prerequisite: A.6/46 – – Additional for 504 (Server Time-out) response

Table A.75A: Supported header fields within the NOTIFY response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Restoration-Info	subclause 7.2.11	n/a	c1	subclause 7.2.11	n/a	n/a
c1: IF A.4/110 THEN o ELSE n/a – – HSS based P-CSCF restoration.

Prerequisite A.5/11 – – NOTIFY response

Table A.76: Supported message bodies within the NOTIFY response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

A.2.1.4.9 OPTIONS method

Prerequisite A.5/12 – – OPTIONS request

Table A.77: Supported header fields within the OPTIONS request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	m	m	[26] 20.1	m	m
1A	Accept-Contact	[56B] 9.2	c21	c21	[56B] 9.2	c26	c26
2	Accept-Encoding	[26] 20.2	m	m	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	m	m	[26] 20.3	m	m
3A	Allow	[26] 20.5	o	o	[26] 20.5	m	m
4	Allow-Events	[28] 8.2.2	c24	c24	[28] 8.2.2	c1	c1
5	Authorization	[26] 20.7	c2	c2	[26] 20.7	c2	c2
6	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
7	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
7A	Cellular-Network-Info	7.2.15	n/a	c44	7.2.15	n/a	c45
8	Contact	[26] 20.10	o	o	[26] 20.10	o	o
9	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
10	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
10A	Content-ID	[256] 3.2	o	c48	[256] 3.2	m	c49
11	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
12	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
13	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
14	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
15	Date	[26] 20.17	c3	c3	[26] 20.17	m	m
15A	Feature-Caps	[190]	c42	c42	[190]	c41	c41
16	From	[26] 20.20	m	m	[26] 20.20	m	m
16A	Geolocation	[89] 4.1	c27	c27	[89] 4.1	c27	c27
16B	Geolocation-Routing	[89] 4.2	c27	c27	[89] 4.2	c27	c27
16C	History-Info	[66] 4.1	c25	c25	[66] 4.1	c25	c25
16D	Max-Breadth	[117] 5.8	n/a	c31	[117] 5.8	c32	c32
17	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c39
18	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
19	Organization	[26] 20.25	o	o	[26] 20.25	o	o
19A	P-Access-Network-Info	[52] 4.4, [234] 2	c11	c12	[52] 4.4, [234] 2	c11	c13
19B	P-Asserted-Identity	[34] 9.1	n/a	c46	[34] 9.1	c6	c6
19C	P-Asserted-Service	[121] 4.1	n/a	c47	[121] 4.1	c30	c30
19D	P-Called-Party-ID	[52] 4.2	x	x	[52] 4.2	c9	c9
19E	P-Charging-Function-Addresses	[52] 4.5	c16	c17	[52] 4.5	c16	c17
19F	P-Charging-Vector	[52] 4.6	c14	c15	[52] 4.6	c14	c15
19H	P-Preferred-Identity	[34] 9.2	c6	c4	[34] 9.2	n/a	n/a
19I	P-Preferred-Service	[121] 4.2	c29	c28	[121] 4.2	n/a	n/a
19J	P-Private-Network-Indication	[134]	c34	c34	[134]	c34	c34
19K	P-Profile-Key	[97] 5	n/a	n/a	[97] 5	n/a	n/a
19L	P-Served-User	[133] 6	c38	c38	[133] 6	c38	c38
19M	P-User-Database	[82] 4	n/a	n/a	[82] 4	n/a	n/a
19N	P-Visited-Network-ID	[52] 4.3	x (note 2)	x	[52] 4.3	c10	n/a
19O	Privacy	[33] 4.2	c8	c8	[33] 4.2	c8	c8
20	Proxy-Authorization	[26] 20.28	c5	c5	[26] 20.28	n/a	n/a
21	Proxy-Require	[26] 20.29	o	o (note 1)	[26] 20.29	n/a	n/a
21A	Reason	[34A] 2	c20	c20	[34A] 2	c20	c20
22	Record-Route	[26] 20.30	n/a	c39	[26] 20.30	n/a	c39
22A	Recv-Info	[25] 5.2.3	c37	c37	[25] 5.2.3	c37	c37
22B	Referred-By	[59] 3	c22	c22	[59] 3	c23	c23
22C	Reject-Contact	[56B] 9.2	c21	c21	[56B] 9.2	c26	c26
22D	Relayed-Charge	7.2.12	n/a	c43	7.2.12	n/a	c43
22E	Request-Disposition	[56B] 9.1	c21	c21	[56B] 9.1	c26	c26
23	Require	[26] 20.32	m	m	[26] 20.32	m	m
23A	Resource-Priority	[116] 3.1	c33	c33	[116] 3.1	c33	c33
24	Route	[26] 20.34	m	m	[26] 20.34	n/a	n/a
24A	Security-Client	[48] 2.3.1	c18	c18	[48] 2.3.1	n/a	n/a
24B	Security-Verify	[48] 2.3.1	c19	c19	[48] 2.3.1	n/a	n/a
24C	Session-ID	[162]	o	c40	[162]	o	c40
25	Supported	[26] 20.37	c6	c6	[26] 20.37	m	m
26	Timestamp	[26] 20.38	c7	c7	[26] 20.38	m	m
27	To	[26] 20.39	m	m	[26] 20.39	m	m
28	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
29	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c2: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c3: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c4: IF A.3/1 AND A.4/25 THEN o ELSE n/a – – UE and private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c5: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c6: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c7: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c8: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c9: IF A.4/32 THEN o ELSE n/a – – the P-Called-Party-ID extension. c10: IF A.4/33 THEN o ELSE n/a – – the P-Visited-Network-ID extension. c11: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c12: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c13: IF A.4/34 AND (A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA, AS acting as third-party call controller or EATF. c14: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c15: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c16: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c17: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c18: IF A.4/37 OR A.4/37A THEN o ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media (note 3). c19: IF A.4/37 OR A.4/37A THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media. c20: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c21: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c22: IF A.4/43 THEN m ELSE n/a – – the SIP Referred-By mechanism. c23: IF A.4/43 THEN o ELSE n/a – – the SIP Referred-By mechanism. c24: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c25: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c26: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c27: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c28: IF (A.3/1 OR A.3A/81) AND A.4/74 THEN o ELSE n/a – – UE, MSC Server enhanced for ICS and SIP extension for the identification of services. c29: IF A.4/74 THEN o ELSE n/a – – SIP extension for the identification of services. c30: IF A.4/74 THEN m ELSE n/a – – SIP extension for the identification of services. c31: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13) THEN m ELSE IF A.3/1 AND NOT A.3C/1 – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), UE, UE performing the functions of an external attached network. c32: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c33: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol. c34: IF A.4/77 THEN m ELSE n/a – – the SIP P-Private-Network-Indication private-header (P-Header). c37: IF A.4/13 THEN m ELSE IF A.4/13A THEN m ELSE n/a – – SIP INFO method and package framework, legacy INFO usage. c38: IF A.4/78 THEN m ELSE n/a – – the SIP P-Served-User private header. c39: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c40: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c41: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c42: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network. c43: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c44: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c45: IF A.4/113 AND (A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA, AS acting as third-party call controller or EATF. c46: IF A.4/25 AND (A.3/7B OR A.3/8 OR A.3A/81A) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and AS acting as originating UA, MRFC, MSC server enhanced for SRVCC using SIP interface. c47: IF A.4/74 AND A.3/7B THEN o ELSE n/a – – SIP extension for the identification of services and AS acting as originating UA. c48: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c49: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE 1: No distinction has been made in these tables between first use of a request on a From/To/Call-ID combination, and the usage in a subsequent one. Therefore the use of "o" etc. above has been included from a viewpoint of first usage. NOTE 2: The strength of this requirement in RFC 7315 [52] is SHOULD NOT, rather than MUST NOT. NOTE 3: Support of this header in this method is dependent on the security mechanism and the security architecture which is implemented. Use of this header in this method is not appropriate to the security mechanism defined by 3GPP TS 33.203 [19].

Prerequisite A.5/12 – – OPTIONS request

Table A.78: Supported message bodies within the OPTIONS request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

Table A.79: Void

Prerequisite A.5/13 – – OPTIONS response

Prerequisite: A.6/1 – – Additional for 100 (Trying) response

Table A.79A: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
6	To	[26] 20.39	m	m	[26] 20.39	m	m
7	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses.

Prerequisite A.5/13 – – OPTIONS response for all remaining status-codes

Table A.80: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Allow	[26] 20.5	c12	c12	[26] 20.5	m	m
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
1A	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
1B	Cellular-Network-Info	7.2.15	n/a	c20	7.2.15	n/a	c21
2	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
3	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
3A	Content-ID	[256] 3.2	o	c23	[256] 3.2	m	c24
4	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
5	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
6	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
7	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
8	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
9	From	[26] 20.20	m	m	[26] 20.20	m	m
9A	Geolocation-Error	[89] 4.3	c14	c14	[89] 4.3	c14	c14
9B	History-Info	[66] 4.1	c13	c13	[66] 4.1	c13	c13
10	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
11	Organization	[26] 20.25	o	o	[26] 20.25	o	o
11A	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c5	c6	[52] 4.4, [52A] 4, [234] 2	c5	c7
11B	P-Asserted-Identity	[34] 9.1	n/a	c22	[34] 9.1	c3	c3
11C	P-Charging-Function-Addresses	[52] 4.5, [52A] 4	c10	c11	[52] 4.5, [52A] 4	c10	c11
11D	P-Charging-Vector	[52] 4.6, [52A] 4	c8	c9	[52] 4.6, [52A] 4	c8	c9
11F	P-Preferred-Identity	[34] 9.2	c3	x	[34] 9.2	n/a	n/a
11G	Privacy	[33] 4.2	c4	c4	[33] 4.2	c4	c4
11H	Recv-Info	[25] 5.2.3	c17	c17	[25] 5.2.3	c17	c17
11I	Relayed-Charge	7.2.12	n/a	c19	7.2.12	n/a	c19
11J	Require	[26] 20.32	m	m	[26] 20.32	m	m
11K	Server	[26] 20.35	o	o	[26] 20.35	o	o
11L	Session-ID	[162]	o	c18	[162]	o	c18
12	Timestamp	[26] 20.38	m	m	[26] 20.38	c2	c2
13	To	[26] 20.39	m	m	[26] 20.39	m	m
13A	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
14	Via	[26] 20.42	m	m	[26] 20.42	m	m
15	Warning	[26] 20.43	o (note)	o	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c3: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c4: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c5: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c6: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c7: IF A.4/34 AND (A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA, AS acting as third-party call controller, or EATF. c8: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c9: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c10: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c11: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c12: IF A.6/102 OR A.6/18 THEN m ELSE o – – 2xx response, 405 (Method Not Allowed). c13: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c14: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c17: IF A.4/13 THEN m ELSE IF A.4/13A THEN m ELSE n/a – – SIP INFO method and package framework, legacy INFO usage. c18: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c19: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c20: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c21: IF A.4/113 AND (A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller, or EATF. c22: IF A.4/25 AND (A.3/7B OR A.3/8) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and AS acting as originating UA, MRFC. c23: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c24: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE: RFC 3261 [26] gives the status of this header as SHOULD rather than OPTIONAL.

Prerequisite A.5/13 – – OPTIONS response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.81: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	m	m	[26] 20.1	m	m
1A	Accept-Encoding	[26] 20.2	m	m	[26] 20.2	m	m
1B	Accept-Language	[26] 20.3	m	m	[26] 20.3	m	m
1C	Accept-Resource-Priority	[116] 3.2	c14	c14	[116] 3.2	c14	c14
2	Allow-Events	[28] 8.2.2	c3	c3	[28] 8.2.2	c4	c4
3	Authentication-Info	[26] 20.6	c1	c1	[26] 20.6	c2	c2
5	Contact	[26] 20.10	o	o	[26] 20.10	o	o
6	Feature-Caps	[190]	c16	c16	[190]	c15	c15
7	Recv-Info	[25] 5.2.3	c6	c6	[25] 5.2.3	c6	c6

12	Supported	[26] 20.37	m	m	[26] 20.37	m	m
c1: IF A.4/7 THEN o ELSE n/a – – authentication between UA and UA. c2: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c3: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c4: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c6: IF A.4/13 THEN m ELSE n/a – – SIP INFO method and package framework. c14: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol. c15: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c16: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network.

Prerequisite A.5/13 – – OPTIONS response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.81A: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	o
2	Response-Source	7.2.17	n/a	c1	7.2.17	n/a	c1
c1: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses?

Prerequisite A.5/13 – – OPTIONS response

Prerequisite: A.6/103 OR A.6/35 – – Additional for 3xx or 485 (Ambiguous) response

Table A.82: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Contact	[26] 20.10	o (note)	o	[26] 20.10	m	m
NOTE: RFC 3261 [26] gives the status of this header as SHOULD rather than OPTIONAL.

Prerequisite A.5/13 – – OPTIONS response

Prerequisite: A.6/14 – – Additional for 401 (Unauthorized) response

Table A.83: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
10	WWW-Authenticate	[26] 20.44	o	o	[26] 20.44	o	o
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/13 – – OPTIONS response

Table A.84: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
5	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.85: Void

Prerequisite A.5/13 – – OPTIONS response

Prerequisite: A.6/20 – – Additional for 407 (Proxy Authentication Required) response

Table A.86: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
8	WWW-Authenticate	[26] 20.44	o	o	[26] 20.44	o	o
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Table A.86A: Void

Prerequisite A.5/13 – – OPTIONS response

Prerequisite: A.6/25 – – Additional for 415 (Unsupported Media Type) response

Table A.87: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o.1	o.1	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o.1	o.1	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o.1	o.1	[26] 20.3	m	m
o.1 At least one of these capabilities is supported.

Prerequisite A.5/13 – – OPTIONS response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.87A: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol.

Prerequisite A.5/13 – – OPTIONS response

Prerequisite: A.6/27 – – Additional for 420 (Bad Extension) response

Table A.88: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
7	Unsupported	[26] 20.40	m	m	[26] 20.40	m	m

Prerequisite A.5/13 – – OPTIONS response

Prerequisite: A.6/28 OR A.6/41A – – Additional 421 (Extension Required), 494 (Security Agreement Required) response

Table A.88A: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Security-Server	[48] 2	x	x	[48] 2	c1	c1
c1: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol.

Table A.89: Void

Prerequisite A.5/13 – – OPTIONS response

Prerequisite: A.6/46 – – Additional for 504 (Server Time-out) response

Table A.89A: Supported header fields within the OPTIONS response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Restoration-Info	subclause 7.2.11	n/a	c1	subclause 7.2.11	n/a	n/a
c1: IF A.4/110 THEN o ELSE n/a – – HSS based P-CSCF restoration.

Prerequisite A.5/13 – – OPTIONS response

Table A.90: Supported message bodies within the OPTIONS response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	application/cccex	[9B]	n/a	c1	[9B]	n/a	c2
c1: IF A.3A/12 THEN o ELSE n/a – – conference participant. c2: IF A.3A/11 THEN o ELSE n/a – – conference focus.

A.2.1.4.10 PRACK method

Prerequisite A.5/14 – – PRACK request

Table A.91: Supported header fields within the PRACK request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o	o	[26] 20.1	m	m
1A	Accept-Contact	[56B] 9.2	c15	c15	[56B] 9.2	c18	c18
2	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
3A	Allow	[26] 20.5	o	o	[26] 20.5	m	m
4	Allow-Events	[28] 8.2.2	c1	c1	[28] 8.2.2	c2	c2
5	Authorization	[26] 20.7	c3	c3	[26] 20.7	c3	c3
6	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
6A	Cellular-Network-Info	7.2.15	n/a	c41	7.2.15	n/a	c42
7	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
8	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
8A	Content-ID	[256] 3.2	o	c44	[256] 3.2	m	c45
9	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
10	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
11	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
12	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
13	Date	[26] 20.17	c4	c4	[26] 20.17	m	m
14	From	[26] 20.20	m	m	[26] 20.20	m	m
14A	Max-Breadth	[117] 5.8	n/a	c21	[117] 5.8	c22	c22
15	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c34
16	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
16A	P-Access-Network-Info	[52] 4.4, [234] 2	c9	c10	[52] 4.4, [234] 2	c9	c11
16B	P-Charging-Function-Addresses	[52] 4.5	c13	c14	[52] 4.5	c13	c14
16C	P-Charging-Vector	[52] 4.6	c12	c40	[52] 4.6	c12	c40
16E	P-Early-Media	[109] 8	c39	c39	[109] 8	c39	c39
16EA	Priority-Share	Subclause 7.2.16	n/a	c43	Subclause 7.2.16	n/a	c43
16F	Privacy	[33] 4.2	c6	n/a	[33] 4.2	c6	n/a
17	Proxy-Authorization	[26] 20.28	c5	c5	[26] 20.28	n/a	n/a
18	Proxy-Require	[26] 20.29	o	n/a	[26] 20.29	n/a	n/a
19	RAck	[27] 7.2	m	m	[27] 7.2	m	m
19A	Reason	[34A] 2	c7	c7	[34A] 2	c7	c7
20	Record-Route	[26] 20.30	n/a	c34	[26] 20.30	n/a	c34
20A	Recv-Info	[25] 5.2.3	c35	c35	[25] 5.2.3	c35	c35
20B	Referred-By	[59] 3	c16	c16	[59] 3	c17	c17
20C	Reject-Contact	[56B] 9.2	c15	c15	[56B] 9.2	c18	c18
20D	Relayed-Charge	7.2.12	n/a	c37	7.2.12	n/a	c37
20E	Request-Disposition	[56B] 9.1	c15	c15	[56B] 9.1	c18	c18
21	Require	[26] 20.32	m	m	[26] 20.32	m	m
21A	Resource-Priority	[116] 3.1	c33	c33	[116] 3.1	c33	c33
21B	Resource-Share	Subclause 7.2.13	n/a	c38	Subclause 7.2.13	n/a	c38
22	Route	[26] 20.34	m	m	[26] 20.34	n/a	c34
22A	Session-ID	[162]	o	c36	[162]	o	c36
23	Supported	[26] 20.37	o	o	[26] 20.37	m	m
24	Timestamp	[26] 20.38	c8	c8	[26] 20.38	m	m
25	To	[26] 20.39	m	m	[26] 20.39	m	m
26	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
27	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c2: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c3: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c4: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c5: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c6: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c7: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c8: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c9: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c10: IF A.4/34 AND (A.3/1 OR A.3/2A OR A.3/7 OR A.3A/81) THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE, P-CSCF (IMS-ALG), AS or MSC server enhanced for ICS. c11: IF A.4/34 AND (A.3/2A OR A.3A/81 OR A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the P-Access-Network-Info header extension and P-CSCF (IMS-ALG), MSC server enhanced for ICS, AS acting as terminating UA, AS acting as third-party call controller or EATF. c12: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c13: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c14: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c15: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c16: IF A.4/43 THEN m ELSE n/a – – the SIP Referred-By mechanism. c17: IF A.4/43 THEN o ELSE n/a – – the SIP Referred-By mechanism. c18: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c21: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), UE, UE performing the functions of an external attached network. c22: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c33: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol. c34: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c35: IF A.4/13 THEN m ELSE IF A.4/13A THEN m ELSE n/a – – SIP INFO method and package framework, legacy INFO usage. c36: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c37: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c38 IF A.4/112 THEN o ELSE n/a – – resource sharing. c39: IF A.4/66 THEN m ELSE n/a – – The SIP P-Early-Media private header extension for authorization of early media. c40: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c41: IF A.4/113 AND (A.3/1 OR A.3/2A OR A.3/7) THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE, P-CSCF (IMS-ALG) or AS. c42: IF A.4/113 AND (A.3/2A OR A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the Cellular-Network-Info header extension and P-CSCF (IMS-ALG), AS acting as terminating UA or AS acting as third-party call controller or EATF. c43: IF A.4/114 THEN o ELSE n/a – – priority sharing. c44: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c45: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).

Prerequisite A.5/14 – – PRACK request

Table A.92: Supported message bodies within the PRACK request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

Table A.93: Void

Prerequisite A.5/15 – – PRACK response

Prerequisite: A.6/1 – – Additional for 100 (Trying) response

Table A.93A: Supported header fields within the PRACK response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
6	To	[26] 20.39	m	m	[26] 20.39	m	m
7	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses.

Prerequisite A.5/15 – – PRACK response for all remaining status-codes

Table A.94: Supported header fields within the PRACK response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Allow	[26] 20.5	c9	c9	[26] 20.5	m	m
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
1A	Cellular-Network-Info	7.2.15	n/a	c17	7.2.15	n/a	c18
2	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
3	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
3A	Content-ID	[256] 3.2	o	c19	[256] 3.2	m	c20
4	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
5	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
6	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
7	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
8	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
9	From	[26] 20.20	m	m	[26] 20.20	m	m
10	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
10A	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c3	c4	[52] 4.4, [52A] 4, [234] 2	c3	c5
10B	P-Charging-Function-Addresses	[52] 4.5, [52A] 4	c7	c8	[52] 4.5, [52A] 4	c7	c8
10C	P-Charging-Vector	[52] 4.6, [52A] 4	c6	c16	[52] 4.6, [52A] 4	c6	c16
10F	Privacy	[33] 4.2	c2	n/a	[33] 4.2	c2	n/a
10G	Recv-Info	[25] 5.2.3	c13	c13	[25] 5.2.3	c13	c13
10H	Relayed-Charge	7.2.12	n/a	c15	7.2.12	n/a	c15
10I	Require	[26] 20.32	m	m	[26] 20.32	m	m
10J	Server	[26] 20.35	o	o	[26] 20.35	o	o
10K	Session-ID	[162]	o	c14	[162]	o	c14
11	Timestamp	[26] 20.38	m	m	[26] 20.38	c2	c2
12	To	[26] 20.39	m	m	[26] 20.39	m	m
12A	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
13	Via	[26] 20.42	m	m	[26] 20.42	m	m
14	Warning	[26] 20.43	o (note)	o	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c3: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c4: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c5: IF A.4/34 AND (A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA, AS acting as third-party call controller or EATF. c6: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c7: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c8: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c9: IF A.6/18 THEN m ELSE o – – 405 (Method Not Allowed) c13: IF A.4/13 THEN m ELSE IF A.4/13A THEN m ELSE n/a – – SIP INFO method and package framework, legacy INFO usage. c14: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c15: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c16: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c17: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c18: IF A.4/113 AND (A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller or EATF. c19: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c20: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE: RFC 3261 [26] gives the status of this header as SHOULD rather than OPTIONAL.

Prerequisite A.5/15 – – PRACK response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.95: Supported header fields within the PRACK response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Accept-Resource-Priority	[116] 3.2	c14	c14	[116] 3.2	c14	c14
0B	Allow-Events	[28] 8.2.2	c3	c3	[28] 8.2.2	c4	c4
0C	Authentication-Info	[26] 20.6	c1	c1	[26] 20.6	c2	c2
0D	P-Early-Media	[109] 8	c5	c5	[109] 8	c5	c5
1	Priority-Share	Subclause 7.2.16	n/a	c16	Subclause 7.2.16	n/a	c16
2A	Resource-Share	Subclause 7.2.13	n/a	c15	Subclause 7.2.13	n/a	c15
3	Supported	[26] 20.37	m	m	[26] 20.37	m	m
c1: IF A.4/7 THEN o ELSE n/a – – authentication between UA and UA. c2: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c3: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c4: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c5: IF A.4/66 THEN m ELSE n/a – – the SIP P-Early-Media private header extension for authorization of early media. c14: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol. c15: IF A.4/112 THEN o ELSE n/a – – resource sharing. c16: IF A.4/114 THEN o ELSE n/a – – priority sharing.

Prerequisite A.5/15 – – PRACK response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.95A: Supported header fields within the PRACK response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	o
2	Response-Source	7.2.17	n/a	c1	7.2.17	n/a	c1
c1: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses?

Prerequisite A.5/15 – – PRACK response

Prerequisite: A.6/103 OR A.6/35 – – Additional for 3xx or 485 (Ambiguous) response

Table A.96: Supported header fields within the PRACK response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Contact	[26] 20.10	o (note)	o	[26] 20.10	m	m
NOTE: RFC 3261 [26] gives the status of this header field as SHOULD rather than OPTIONAL.

Prerequisite A.5/15 – – PRACK response

Prerequisite: A.6/14 – – Additional for 401 (Unauthorized) response

Table A.97: Supported header fields within the PRACK response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
2	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
8	WWW-Authenticate	[26] 20.44	m	m	[26] 20.44	m	m
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/15 – – PRACK response

Table A.98: Supported header fields within the PRACK response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.99: Void

Prerequisite A.5/15 – – PRACK response

Prerequisite: A.6/20 – – Additional for 407 (Proxy Authentication Required) response

Table A.100: Supported header fields within the PRACK response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
2	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
6	WWW-Authenticate	[26] 20.44	o	o	[26] 20.44	o	o
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/15 – – PRACK response

Prerequisite: A.6/25 – – Additional for 415 (Unsupported Media Type) response

Table A.101: Supported header fields within the PRACK response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o.1	o.1	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o.1	o.1	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o.1	o.1	[26] 20.3	m	m

Prerequisite A.5/15 – – PRACK response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.101A: Supported header fields within the PRACK response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol.

Prerequisite A.5/15 – – PRACK response

Prerequisite: A.6/27 – – Additional for 420 (Bad Extension) response

Table A.102: Supported header fields within the PRACK response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
5	Unsupported	[26] 20.40	m	m	[26] 20.40	m	m

Prerequisite A.5/15 – – PRACK response

Prerequisite: A.6/28 OR A.6/41A – – Additional for 421 (Extension Required), 494 (Security Agreement Required) response

Table A.102A: Supported header fields within the PRACK response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Security-Server	[48] 2	x	x	[48] 2	c1	c1
c1: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol.

Table A.103: Void

Prerequisite A.5/15 – – PRACK response

Table A.104: Supported message bodies within the PRACK response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

A.2.1.4.10A PUBLISH method

Prerequisite A.5/15A – PUBLISH request

Table A.104A: Supported header fields within the PUBLISH request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Contact	[56B] 9.2	c22	c22	[56B] 9.2	c28	c28
2	Allow	[26] 20.5	o	o	[26] 20.5	m	m
3	Allow-Events	[28] 8.2.2	c1	c1	[28] 8.2.2	c2	c2
4	Authorization	[26] 20.7	c3	c3	[26] 20.7	c3	c3
5	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
6	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
6A	Cellular-Network-Info	7.2.15	n/a	c43	7.2.15	n/a	c44
6B	Contact	[70] 4	o	o	[70] 6	n/a	n/a
7	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
8	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
8A	Content-ID	[256] 3.2	o	c47	[256] 3.2	m	c48
9	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
10	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
11	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
12	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
13	Date	[26] 20.17	c4	c4	[26] 20.17	m	m
14	Event	[70] 4, 6	m	m	[70] 4, 6	m	m
15	Expires	[26] 20.19, [70] 4, 5, 6	o	o	[26] 20.19, [70] 4, 5, 6	m	m
15A	Feature-Caps	[190]	c41	c41	[190]	c40	c40
16	From	[26] 20.20	m	m	[26] 20.20	m	m
16A	Geolocation	[89] 4.1	c38	c38	[89] 4.1	c38	c38
16B	Geolocation-Routing	[89] 4.2	c38	c38	[89] 4.2	c38	c38
16C	History-Info	[66] 4.1	c27	c27	[66] 4.1	c27	c27
17	In-Reply-To	[26] 20.21	o	o	[26] 20.21	o	o
17A	Max-Breadth	[117] 5.8	n/a	c23	[117] 5.8	c24	c24
18	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c37
19	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
20	Organization	[26] 20.25	o	o	[26] 20.25	o	o
21	P-Access-Network-Info	[52] 4.4, [234] 2	c15	c16	[52] 4.4, [234] 2	c15	c17
22	P-Asserted-Identity	[34] 9.1	n/a	c45	[34] 9.1	c11	c11
22A	P-Asserted-Service	[121] 4.1	n/a	c46	[121] 4.1	c31	c31
23	P-Called-Party-ID	[52] 4.2	x	x	[52] 4.2	c13	c13
24	P-Charging-Function-Addresses	[52] 4.5	c20	c21	[52] 4.5	c20	c21
25	P-Charging-Vector	[52] 4.6	c18	c19	[52] 4.6	c18	c19
26	P-Preferred-Identity	[34] 9.2	c11	c7	[34] 9.2	n/a	n/a
26A	P-Preferred-Service	[121] 4.2	c31	c30	[121] 4.2	n/a	n/a
26B	P-Private-Network-Indication	[134]	c33	c33	[134]	c33	c33
26C	P-Profile-Key	[97] 5	n/a	n/a	[97] 5	n/a	n/a
26D	P-Served-User	[133] 6	c36	c36	[133] 6	c36	c36
26E	P-User-Database	[82] 4	n/a	n/a	[82] 4	n/a	n/a
27	P-Visited-Network-ID	[52] 4.3	x (note 3)	x	[52] 4.3	c14	n/a
28	Priority	[26] 20.26	o	o	[26] 20.26	o	o
29	Privacy	[33] 4.2	c12	c12	[33] 4.2	c12	c12
30	Proxy-Authorization	[26] 20.28	c5	c5	[26] 20.28	n/a	n/a
31	Proxy-Require	[26] 20.29	o	n/a	[26] 20.29	n/a	n/a
32	Reason	[34A] 2	c8	c8	[34A] 2	c8	c8
33A	Referred-By	[59] 3	c25	c25	[59] 3	c26	c26
34	Reject-Contact	[56B] 9.2	c22	c22	[56B] 9.2	c28	c28
34A	Relayed-Charge	7.2.12	n/a	c42	7.2.12	n/a	c42
34B	Reply-To	[26] 20.31	o	o	[26] 20.31	o	o
35	Request-Disposition	[56B] 9.1	c22	c22	[56B] 9.1	c28	c28
36	Require	[26] 20.32	m	m	[26] 20.32	m	m
36A	Resource-Priority	[116] 3.1	c29	c29	[116] 3.1	c29	c29
37	Route	[26] 20.34	m	m	[26] 20.34	n/a	c37
38	Security-Client	[48] 2.3.1	c9	c9	[48] 2.3.1	n/a	n/a
39	Security-Verify	[48] 2.3.1	c10	c10	[48] 2.3.1	n/a	n/a
39A	Session-ID	[162]	o	c39	[162]	o	c39
40	SIP-If-Match	[70] 11.3.2	o	o	[70] 11.3.2	m	m
41	Subject	[26] 20.36	o	o	[26] 20.36	o	o
42	Supported	[26] 20.37, [26] 7.1	o	o	[26] 20.37, [26] 7.1	m	m
43	Timestamp	[26] 20.38	c6	c6	[26] 20.38	m	m
44	To	[26] 20.39	m	m	[26] 20.39	m	m
45	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
46	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c2: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c3: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c4: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c5: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c6: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c7: IF A.3/1 AND A.4/25 THEN o ELSE n/a – – UE and private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c8: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c9: IF A.4/37 OR A.4/37A THEN o ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media (note 1). c10: IF A.4/37 OR A.4/37A THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media. c11: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c12: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c13: IF A.4/32 THEN o ELSE n/a – – the P-Called-Party-ID extension. c14: IF A.4/33 THEN o ELSE n/a – – the P-Visited-Network-ID extension. c15: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c16: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c17: IF A.4/34 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c18: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c19: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c20: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c21: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c22: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c23: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), UE, UE performing the functions of an external attached network. c24: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c25: IF A.4/43 THEN m ELSE n/a – – the SIP Referred-By mechanism. c26: IF A.4/43 THEN o ELSE n/a – – the SIP Referred-By mechanism. c27: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c28: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c29: IF A.4/70B THEN m ELSE n/a – – inclusion of CANCEL, BYE, REGISTER and PUBLISH in communications resource priority for the session initiation protocol. c30: IF (A.3/1 OR A.3A/81) AND A.4/74 THEN o ELSE n/a – – UE, MSC Server enhanced for ICS and SIP extension for the identification of services. c31: IF A.4/74 THEN o ELSE n/a – – SIP extension for the identification of services. c32: IF A.4/74 THEN m ELSE n/a – – SIP extension for the identification of services. c33: IF A.4/77 THEN m ELSE n/a – – the SIP P-Private-Network-Indication private-header (P-Header). c36: IF A.4/78 THEN m ELSE n/a – – the SIP P-Served-User private header. c37: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c38: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c39: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c40: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c41: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network. c42: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c43: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c44: IF A.4/113 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c45: IF A.4/25 AND (A.3/7B OR A.3/8) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and AS acting as originating UA, MRFC. c46: IF A.4/74 AND A.3/7B THEN o ELSE n/a – – SIP extension for the identification of services and AS acting as originating UA. c47: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c48: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE 1: Support of this header in this method is dependent on the security mechanism and the security architecture which is implemented. NOTE 2: The strength of this requirement in RFC 7315 [52] is SHOULD NOT, rather than MUST NOT.

Prerequisite A.5/15A – – PUBLISH request

Table A.104B: Supported message bodies within the PUBLISH request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	application/vnd.3gpp.mcptt-info+xml	[8ZE]	n/a	c1	[8ZE]	n/a	c1
2	application/poc-settings+xml	[110]	o	c2	[110]	o	c3
3	application/pidf+xml (NOTE)	[242]	o	c1	[242]	o	c3
c1: IF A.3A/102 OR A.3A/103 THEN m ELSE n/a – – MCPTT client, MCPTT server. c2: IF A.3A/102 THEN m ELSE n/a – – MCPTT client. c3: IF A.3A/103 THEN m ELSE n/a – – MCPTT server.
NOTE: The application/pidf+xml is extended by 3GPP TS 24.379 [8ZE].

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/1 – – Additional for 100 (Trying) response

Table A.104BA: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
6	To	[26] 20.39	m	m	[26] 20.39	m	m
7	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses.

Prerequisite A.5/15B – – PUBLISH response for all remaining status-codes

Table A.104C: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Allow	[26] 20.5	c12	c12	[26] 20.5	m	m
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Call-Info	[26] 24.9	o	o	[26] 24.9	m	m
2A	Cellular-Network-Info	7.2.15	n/a	c19	7.2.15	n/a	c20
3	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
4	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
4A	Content-ID	[256] 3.2	o	c22	[256] 3.2	m	c23
5	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
6	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
7	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
8	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
9	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
9A	Expires	[26] 20.19 [70] 4, 5, 6	o	o	[26] 20.19 [70] 4, 5, 6	o	o
10	From	[26] 20.20	m	m	[26] 20.20	m	m
10A	Geolocation-Error	[89] 4.3	c16	c16	[89] 4.3	c16	c16
10B	History-Info	[66] 4.1	c13	c13	[66] 4.1	c13	c13
11	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
12	Organization	[26] 20.25	o	o	[26] 20.25	o	o
13	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c5	c6	[52] 4.4, [52A] 4, [234] 2	c5	c7
14	P-Asserted-Identity	[34] 9.1	n/a	c21	[34] 9.1	c3	c3
15	P-Charging-Function-Addresses	[52] 4.5, [52A] 4	c10	c11	[52] 4.5, [52A] 4	c10	c11
16	P-Charging-Vector	[52] 4.6, [52A] 4	c8	c9	[52] 4.6, [52A] 4	c8	c9
17	P-Preferred-Identity	[34] 9.2	c3	x	[34] 9.2	n/a	n/a
18	Privacy	[33] 4.2	c4	c4	[33] 4.2	c4	c4
18A	Relayed-Charge	7.2.12	n/a	c18	7.2.12	n/a	c18
19	Require	[26] 20.32	m	m	[26] 20.32	m	m
20	Server	[26] 20.35	o	o	[26] 20.35	o	o
20A	Session-ID	[162]	o	c17	[162]	o	c17
21	Timestamp	[26] 20.38	m	m	[26] 20.38	c2	c2
22	To	[26] 20.39	m	m	[26] 20.39	m	m
23	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
24	Via	[26] 20.42	m	m	[26] 20.42	m	m
25	Warning	[26] 20.43	o	o	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c3: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c4: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c5: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c6: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c7: IF A.4/34 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c8: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c9: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c10: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c11: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c12: IF A.6/18 THEN m ELSE o – – 405 (Method Not Allowed). c13: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c16: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c17: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c18: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c19: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c20: IF A.4/113 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c21: IF A.4/25 AND (A.3/7B OR A.3/8) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and AS acting as originating UA, MRFC. c22: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c23: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE: For a 488 (Not Acceptable Here) response, RFC 3261 [26] gives the status of this header field as SHOULD rather than OPTIONAL.

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.104D: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status


2	Authentication-Info	[26] 20.6	c1	c1	[26] 20.6	c2	c2
3	Expires	[26] 20.19, [70] 4, 5, 6	m	m	[26] 20.19, [70] 4, 5, 6	m	m
3A	Feature-Caps	[190]	c8	c8	[190]	c7	c7

4	SIP-Etag	[70] 11.3.1	m	m	[70] 11.3.1	m	m
5	Supported	[26] 20.37	m	m	[26] 20.37	m	m
c1: IF A.4/7 THEN o ELSE n/a – – authentication between UA and UA. c2: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c7: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c8: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network.

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/6 – – Additional for 200 (OK) response

Table A.104DAA: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70B THEN m ELSE n/a – – inclusion of CANCEL, BYE, REGISTER and PUBLISH in communications resource priority for the session initiation protocol.

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.104DA: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	o
2	Response-Source	7.2.17	n/a	c1	7.2.17	n/a	c1
c1: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses?

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/103 OR A.6/35 – – Additional for 3xx or 485 (Ambiguous) response

Table A.104E: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
2	Contact	[26] 20.10	o	o	[26] 20.10	m	m

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/8 OR A.6/9 OR A.6/10 OR A.6/11OR A.6/12 – Additional for 401 (Unauthorized) response

Table A.104F: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
5	WWW-Authenticate	[26] 20.44	m	m	[26] 20.44	m	m
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/15B – – PUBLISH response

Table A.104G: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.104H: Void

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/20 – – Additional for 407 (Proxy Authentication Required) response

Table A.104I: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
5	WWW-Authenticate	[26] 20.44	o	o	[26] 20.44	o	o
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Table A.104IA: Void

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/25 – – Additional for 415 (Unsupported Media Type) response

Table A.104J: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o.1	o.1	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o.1	o.1	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o.1	o.1	[26] 20.3	m	m
o.1 At least one of these capabilities is supported.

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.104JA: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70B THEN m ELSE n/a – – inclusion of CANCEL, BYE, REGISTER and PUBLISH in communications resource priority for the session initiation protocol.

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/27 – – Additional for 420 (Bad Extension) response

Table A.104K: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Unsupported	[26] 20.40	m	m	[26] 20.40	m	m

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/28 OR A.6/41A – – Additional for 421 (Extension Required), 494 (Security Agreement Required) response

Table A.104L: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Security-Server	[48] 2	x	x	[48] 2	c1	c1
c1: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol.

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/29 – – Additional for 423 (Interval Too Brief) response

Table A.104M: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Min-Expires	[26] 20.23, [70] 5, 6	m	m	[26] 20.23, [70] 5, 6	m	m

Table A.104N: Void

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/39 – – Additional for 489 (Bad Event) response

Table A.104O: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
2	Allow-Events	[28] 8.2.2	m	m	[28] 8.2.2	m	m

Prerequisite A.5/15B – – PUBLISH response

Prerequisite: A.6/46 – – Additional for 504 (Server Time-out) response

Table A.104OA: Supported header fields within the PUBLISH response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Restoration-Info	subclause 7.2.11	n/a	c1	subclause 7.2.11	n/a	n/a
c1: IF A.4/110 THEN o ELSE n/a – – HSS based P-CSCF restoration.

Prerequisite A.5/15B – – PUBLISH response

Table A.104P: Supported message bodies within the PUBLISH response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

A.2.1.4.11 REFER method

Prerequisite A.5/16 – – REFER request

Table A.105: Supported header fields within the REFER request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Accept	[26] 20.1	o	o	[26] 20.1	m	m
0B	Accept-Contact	[56B] 9.2	c22	c22	[56B] 9.2	c25	c25
0C	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
1	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
1AA	Additional-Identity	7.2.20	n/a	c54	7.2.20	n/a	c55
1A	Allow	[26] 20.5	o	o	[26] 20.5	m	m
2	Allow-Events	[28] 8.2.2	c1	c1	[28] 8.2.2	c2	c2
3	Authorization	[26] 20.7	c3	c3	[26] 20.7	c3	c3
4	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
4A	Cellular-Network-Info	7.2.15	n/a	c48	7.2.15	n/a	c49
5	Contact	[26] 20.10	m	m	[26] 20.10	m	m
5A	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
5B	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
5BA	Content-ID	[256] 3.2	o	c52	[256] 3.2	m	c53
5C	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
6	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
7	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
8	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
9	Date	[26] 20.17	c4	c4	[26] 20.17	m	m
10	Expires	[26] 20.19	o	o	[26] 20.19	o	o
10A	Feature-Caps	[190]	c46	c46	[190]	c45	c45
11	From	[26] 20.20	m	m	[26] 20.20	m	m
11A	Geolocation	[89] 4.1	c26	c26	[89] 4.1	c26	c26
11B	Geolocation-Routing	[89] 4.2	c26	c26	[89] 4.2	c26	c26
11C	History-Info	[66] 4.1	c24	c24	[66] 4.1	c24	c24
11D	Max-Breadth	[117] 5.8	n/a	c30	[117] 5.8	c31	c31
12	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c39
13	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
14	Organization	[26] 20.25	o	o	[26] 20.25	o	o
14A	P-Access-Network-Info	[52] 4.4, [234] 2	c12	c13	[52] 4.4, [234] 2	c12	c14
14B	P-Asserted-Identity	[34] 9.1	n/a	c50	[34] 9.1	c8	c8
14C	P-Asserted-Service	[121] 4.1	n/a	c51	[121] 4.1	c29	c29
14D	P-Called-Party-ID	[52] 4.2, [52A] 4	x	x	[52] 4.2, [52A] 4	c10	c10
14E	P-Charging-Function-Addresses	[52] 4.5	c17	c18	[52] 4.5	c17	c18
14F	P-Charging-Vector	[52] 4.6	c15	c16	[52] 4.6	c15	c16
14H	P-Preferred-Identity	[34] 9.2	c8	c7	[34] 9.2	n/a	n/a
14I	P-Preferred-Service	[121] 4.2	c28	c27	[121] 4.2	n/a	n/a
14J	P-Private-Network-Indication	[134]	c36	c36	[134]	c36	c36
14K	P-Profile-Key	[97] 5	n/a	n/a	[97] 5	n/a	n/a
14L	P-Served-User	[133] 6	c41	c41	[133] 6	c41	c41
14M	P-User-Database	[82] 4	n/a	n/a	[82] 4	n/a	n/a
14N	P-Visited-Network-ID	[52] 4.3	x (note 1)	x	[52] 4.3	c11	n/a
14O	Privacy	[33] 4.2	c9	c9	[33] 4.2	c9	c9
15	Proxy-Authorization	[26] 20.28	c5	c5	[26] 20.28	n/a	n/a
16	Proxy-Require	[26] 20.29	o	n/a	[26] 20.29	n/a	n/a
16A	Reason	[34A] 2	c21	c21	[34A] 2	c21	c21
17	Record-Route	[26] 20.30	n/a	c39	[26] 20.30	m	m
17A	Refer-Sub	[173] 4	c40	c40	[173] 4	c40	c40
18	Refer-To	[36] 3	m	m	[36] 3	m	m
18A	Referred-By	[59] 3	c23	c23	[59] 3	c23	c23
18B	Reject-Contact	[56B] 9.2	c22	c22	[56B] 9.2	c25	c25
18C	Relayed-Charge	7.2.12	n/a	c47	7.2.12	n/a	c47
18D	Request-Disposition	[56B] 9.1	c22	c22	[56B] 9.1	c25	c25
19	Require	[26] 20.32	m	m	[26] 20.32	m	m
19A	Resource-Priority	[116] 3.1	c33	c33	[116] 3.1	c33	c33
20	Route	[26] 20.34	m	m	[26] 20.34	n/a	c39
20A	Security-Client	[48] 2.3.1	c19	c19	[48] 2.3.1	n/a	n/a
20B	Security-Verify	[48] 2.3.1	c20	c20	[48] 2.3.1	n/a	n/a
20C	Session-ID	[162]	o	c42	[162]	o	c42
21	Supported	[26] 20.37, [26] 7.1	o	o	[26] 20.37, [26] 7.1	m	m
21A	Target-Dialog	[184] 7	c43	c43	[184] 7	c44	c44
22	Timestamp	[26] 20.38	c6	c6	[26] 20.38	m	m
23	To	[26] 20.39	m	m	[26] 20.39	m	m
23A	Trigger-Consent	[125] 5.11.2	c34	c34	[125] 5.11.2	c35	c35
24	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
25	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c2: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c3: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c4: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c5: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c6: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c7: IF A.3/1 AND A.4/25 THEN o ELSE n/a – – UE and private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c8: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c9: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c10: IF A.4/32 THEN o ELSE n/a – – the P-Called-Party-ID extension. c11: IF A.4/33 THEN o ELSE n/a – – the P-Visited-Network-ID extension. c12: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c13: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c14: IF A.4/34 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c15: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c16: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c17: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c18: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c19: IF A.4/37 OR A.4/37A THEN o ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media (note 2). c20: IF A.4/37 OR A.4/37A THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media. c21: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c22: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c23: IF A.4/43 THEN m ELSE n/a – – the SIP Referred-By Mechanism. c24: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c25: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c26: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c27: IF (A.3/1 OR A.3A/81) AND A.4/74 THEN o ELSE n/a – – UE, MSC Server enhanced for ICS and SIP extension for the identification of services. c28: IF A.4/74 THEN o ELSE n/a – – SIP extension for the identification of services. c29: IF A.4/74 THEN m ELSE n/a – – SIP extension for the identification of services. c30: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), UE, UE performing the functions of an external attached network. c31: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c33: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol. c34: IF A.4/75A THEN m ELSE n/a – – a relay within the framework for consent-based communications in SIP. c35: IF A.4/75B THEN m ELSE n/a – – a recipient within the framework for consent-based communications in SIP. c36: IF A.4/77 THEN m ELSE n/a – – the SIP P-Private-Network-Indication private-header (P-Header). c39: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c40: IF A.4/95 THEN m ELSE n/a – – suppression of session initiation protocol REFER method implicit subscription. c41: IF A.4/78 THEN m ELSE n/a – – the SIP P-Served-User private header. c42: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c43: IF A.4/99 THEN o ELSE n/a – – request authorization through dialog Identification in the session initiation protocol. c44: IF A.4/99 THEN m ELSE n/a – – request authorization through dialog Identification in the session initiation protocol. c45: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c46: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network. c47: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c48: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c49: IF A.4/113 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c50: IF A.4/25 AND (A.3/7B OR A.3/8) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and AS acting as originating UA, MRFC. c51: IF A.4/74 AND A.3/7B THEN o ELSE n/a – – SIP extension for the identification of services and AS acting as originating UA. c52: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c53: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c54: IF A.4/124 THEN o ELSE n/a – – the Additional-Identity header field extension. c55: IF A.4/124 THEN m ELSE n/a – – the Additional-Identity header field extension.
NOTE 1: The strength of this requirement in RFC 7315 [52] is SHOULD NOT, rather than MUST NOT. NOTE 2: Support of this header field in this method is dependent on the security mechanism and the security architecture which is implemented. Use of this header field in this method is not appropriate to the security mechanism defined by 3GPP TS 33.203 [19].

Prerequisite A.5/16 – – REFER request

Table A.106: Supported message bodies within the REFER request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	application/vnd.3gpp.mid-call+xml	[8M] D	n/a	o	[8M] D	n/a	o
2	application/vnd.3gpp.mcptt-info+xml	[8ZE]	n/a	c1	[8ZE]	n/a	c1
c1: IF A.3A/102 OR A.3A/103 THEN m ELSE n/a – – MCPTT client, MCPTT server.

Table A.107: Void

Prerequisite A.5/17 – – REFER response

Prerequisite: A.6/1 – – Additional for 100 (Trying) response

Table A.107A: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
6	To	[26] 20.39	m	m	[26] 20.39	m	m
7	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses.

Prerequisite A.5/17 – – REFER response for all remaining status-codes

Table A.108: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Allow	[26] 20.5	c12	c12	[26] 20.5	m	m
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
1A	Cellular-Network-Info	7.2.15	n/a	c20	7.2.15	n/a	c21
1B	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
2	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
2A	Content-ID	[256] 3.2	o	c23	[256] 3.2	m	c24
3	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
4	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
5	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
6	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
7	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
8	From	[26] 20.20	m	m	[26] 20.20	m	m
8A	Geolocation-Error	[89] 4.3	c15	c15	[89] 4.3	c15	c15
8B	History-Info	[66] 4.1	c14	c14	[66] 4.1	c14	c14
9	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
10	Organization	[26] 20.25	o	o	[26] 20.25	o	o
10A	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c5	c6	[52] 4.4, [52A] 4, [234] 2	c5	c7
10B	P-Asserted-Identity	[34] 9.1	n/a	c22	[34] 9.1	c3	c3
10C	P-Charging-Function-Addresses	[52] 4.5, [52A] 4	c10	c11	[52] 4.5, [52A] 4	c10	c11
10D	P-Charging-Vector	[52] 4.6, [52A] 4	c8	c9	[52] 4.6, [52A] 4	c8	c9
10F	P-Preferred-Identity	[34] 9.2	c3	x	[34] 9.2	n/a	n/a
10G	Privacy	[33] 4.2	c4	c4	[33] 4.2	c4	c4
10H	Relayed-Charge	7.2.12	n/a	c19	7.2.12	n/a	c19
10I	Require	[26] 20.32	m	m	[26] 20.32	m	m
10J	Server	[26] 20.35	o	o	[26] 20.35	o	o
10K	Session-ID	[162]	o	c18	[162]	o	c18
11	Timestamp	[26] 20.38	m	m	[26] 20.38	c2	c2
12	To	[26] 20.39	m	m	[26] 20.39	m	m
12A	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
13	Via	[26] 20.42	m	m	[26] 20.42	m	m
14	Warning	[26] 20.43	o (note)	o	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c3: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c4: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c5: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c6: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c7: IF A.4/34 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c8: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c9: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c10: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c11: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c12: IF A.6/18 THEN m ELSE o – – 405 (Method Not Allowed) c14: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c15: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c18: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c19: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c20: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info extension and UE. c21: IF A.4/113 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c22: IF A.4/25 AND (A.3/7B OR A.3/8) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and AS acting as originating UA, MRFC. c23: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c24: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE: For a 488 (Not Acceptable Here) response, RFC 3261 [26] gives the status of this header field as SHOULD rather than OPTIONAL.

Prerequisite A.5/17 – – REFER response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.109: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Accept-Resource-Priority	[116] 3.2	c12	c12	[116] 3.2	c12	c12
1	Allow-Events	[28] 8.2.2	c3	c3	[28] 8.2.2	c4	c4
2	Authentication-Info	[26] 20.6	c1	c1	[26] 20.6	c2	c2
2A	Contact	[26] 20.10	m	m	[26] 20.10	m	m
3	Feature-Caps	[190]	c15	c15	[190]	c14	c14
5	Record-Route	[26] 20.30	m	m	[26] 20.30	m	m
6	Refer-Sub	[173] 4	c13	c13	[173] 4	c13	c13

8	Supported	[26] 20.37	m	m	[26] 20.37	m	m
c1: IF A.4/7 THEN o ELSE n/a – – authentication between UA and UA. c2: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c3: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c4: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c12: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol. c13: IF A.4/95 THEN m ELSE n/a – – suppression of session initiation protocol REFER method implicit subscription. c14: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c15: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network.

Prerequisite A.5/17 – – REFER response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.109A: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0	Contact	[26] 20.10	o	o	[26] 20.10	m	m
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	o
2	Response-Source	7.2.17	n/a	c1	7.2.17	n/a	c1
c1: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses?

Table A.110: Void

Prerequisite A.5/17 – – REFER response

Prerequisite: A.6/14 – – Additional for 401 (Unauthorized) response

Table A.111: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
10	WWW-Authenticate	[26] 20.44	m	m	[26] 20.44	m	m
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/17 – – REFER response

Table A.112: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
6	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.113: Void

Prerequisite A.5/17 – – REFER response

Prerequisite: A.6/20 – – Additional for 407 (Proxy Authentication Required) response

Table A.114: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
8	WWW-Authenticate	[26] 20.44	o	o	[26] 20.44	o	o
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Table A.114A: Void

Prerequisite A.5/17 – – REFER response

Prerequisite: A.6/25 – – Additional for 415 (Unsupported Media Type) response

Table A.115: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o.1	o.1	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o.1	o.1	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o.1	o.1	[26] 20.3	m	m
o.1 At least one of these capabilities is supported.

Prerequisite A.5/17 – – REFER response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.115A: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol.

Prerequisite A.5/17 – – REFER response

Prerequisite: A.6/27 – – Additional for 420 (Bad Extension) response

Table A.116: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
8	Unsupported	[26] 20.40	m	m	[26] 20.40	m	m

Prerequisite A.5/17 – – REFER response

Prerequisite: A.6/28 OR A.6/41A – – Additional for 421 (Extension Required), 494 (Security Agreement Required) response

Table A.116A: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Security-Server	[48] 2	x	x	[48] 2	c1	c1
c1: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol.

Table A.117: Void

Prerequisite A.5/17 – – REFER response

Prerequisite: A.6/29H – – Additional for 470 (Consent Needed) response

Table A.117A: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Permission-Missing	[125] 5.9.3	m	m	[125] 5.9.3	m	m

Prerequisite A.5/17 – – REFER response

Prerequisite: A.6/46 – – Additional for 504 (Server Time-out) response

Table A.117B: Supported header fields within the REFER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Restoration-Info	subclause 7.2.11	n/a	c1	subclause 7.2.11	n/a	n/a
c1: IF A.4/110 THEN o ELSE n/a – – HSS based P-CSCF restoration.

Prerequisite A.5/17 – – REFER response

Table A.118: Supported message bodies within the REFER response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

A.2.1.4.12 REGISTER method

Prerequisite A.5/18 – – REGISTER request

Table A.119: Supported header fields within the REGISTER request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o	o	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
3A	Allow	[26] 20.5	o	o	[26] 20.5	m	m
4	Allow-Events	[28] 8.2.2	c27	c27	[28] 8.2.2	c1	c1
5	Authorization	[26] 20.7, [49]	c2	c29	[26] 20.7, [49]	m	c22
6	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
7	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
7A	Cellular-Network-Info	7.2.15	n/a	c43	7.2.15	n/a	c44
8	Contact	[26] 20.10	o	m	[26] 20.10	m	m
9	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
10	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
10A	Content-ID	[256] 3.2	o	c45	[256] 3.2	m	c46
11	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
12	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
13	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
14	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
15	Date	[26] 20.17	c3	c3	[26] 20.17	m	m
16	Expires	[26] 20.19	o	o	[26] 20.19	m	m
16A	Feature-Caps	[190]	c40	c40	[190]	c39	c39
17	From	[26] 20.20	m	m	[26] 20.20	m	m
17A	Geolocation	[89] 4.1	c31	c31	[89] 4.1	c31	c31
17B	Geolocation-Routing	[89] 4.2	c31	c31	[89] 4.2	c31	c31
17C	History-Info	[66] 4.1	c28	c28	[66] 4.1	c28	c28
17D	Max-Breadth	[117] 5.8	n/a	c35	[117] 5.8	c36	c36
18	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	n/a
19	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
20	Organization	[26] 20.25	o	o	[26] 20.25	o	o
20A	P-Access-Network-Info	[52] 4.4, [234] 2	c12	c13	[52] 4.4, [234] 2	c12	c14
20B	P-Charging-Function-Addresses	[52] 4.5	c17	c18	[52] 4.5	c17	c18
20C	P-Charging-Vector	[52] 4.6	c15	c16	[52] 4.6	c15	c16
20E	P-User-Database	[82] 4	n/a	n/a	[82] 4	c30	c30
20F	P-Visited-Network-ID	[52] 4.3	x (note 2)	x	[52] 4.3	c10	c11
20G	Path	[35] 4	c4	c5	[35] 4	m	c6
20H	Privacy	[33] 4.2	c9	n/a	[33] 4.2	c9	n/a
21	Proxy-Authorization	[26] 20.28	c8	c8	[26] 20.28	n/a	n/a
22	Proxy-Require	[26] 20.29	o	o (note 1)	[26] 20.29	n/a	n/a
22A	Reason	[34A] 2	c23	c23	[34A] 2	c23	c23
22B	Recv-Info	[25] 5.2.3	c37	c37	[25] 5.2.3	c37	c37
22C	Referred-By	[59] 3	c25	c25	[59] 3	c26	c26
22D	Relayed-Charge	7.2.12	n/a	c41	7.2.12	n/a	c41
22E	Request-Disposition	[56B] 9.1	c24	c24	[56B] 9.1	n/a	n/a
23	Require	[26] 20.32	m	m	[26] 20.32	m	m
23A	Resource-Priority	[116] 3.1	c32	c32	[116] 3.1	c32	c32
23B	Resource-Share	Subclause 7.2.13	n/a	c42	Subclause 7.2.13	n/a	c42
24	Route	[26] 20.34	o	x	[26] 20.34	n/a	n/a
24A	Security-Client	[48] 2.3.1	c19	c20	[48] 2.3.1	n/a	n/a
24B	Security-Verify	[48] 2.3.1	c20	c20	[48] 2.3.1	c21	n/a
24C	Session-ID	[162]	o	c38	[162]	o	c38
25	Supported	[26] 20.37	o	c29	[26] 20.37	m	m
26	Timestamp	[26] 20.38	c7	c7	[26] 20.38	c7	c7
27	To	[26] 20.39	m	m	[26] 20.39	m	m
28	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
29	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c2: IF A.4/8 THEN m ELSE n/a – – authentication between UA and registrar. c3: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c4: IF A.4/24 THEN o ELSE n/a – – session initiation protocol extension header field for registering non-adjacent contacts. c5: IF A.4/24 THEN x ELSE n/a – – session initiation protocol extension header field for registering non-adjacent contacts. c6: IF A.3/4 THEN m ELSE n/a. – – S-CSCF. c7: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c8: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c9: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c10: IF A.4/33 THEN o ELSE n/a – – the P-Visited-Network-ID extension. c11: IF A.4/33 THEN m ELSE n/a – – the P-Visited-Network-ID extension. c12: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c13: IF A.4/34 AND (A.3/1 OR A.3/4) THEN o ELSE n/a – – the P-Access-Network-Info header extension and UE or S-CSCF. c14: IF A.4/34 AND (A.3/4 OR A.3/7A) THEN m ELSE n/a – – the P-Access-Network-Info header extension and S-CSCF or AS acting as terminating UA. c15: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c16: IF A.4/36 OR A.3/4 THEN m ELSE n/a – – the P-Charging-Vector header extension (including S-CSCF as registrar). c17: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c18: IF A.4/35 OR A.3/4 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension (including S-CSCF as registrar). c19: IF A.4/37 OR A.4/37A THEN o ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media (note 3). c20: IF A.4/37 OR A.4/37A THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media. c21: IF A.4/37 AND A.4/2 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol and registrar. c22: IF A.3/4 THEN m ELSE n/a – – S-CSCF. c23: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c24: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c25: IF A.4/43 THEN m ELSE n/a – – the SIP Referred-By mechanism. c26: IF A.4/43 THEN o ELSE n/a – – the SIP Referred-By mechanism. c27: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c28: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c29: IF (A.3/1 OR A.3A/81) THEN m ELSE o – – UE, MSC Server enhanced for ICS. c30: IF A.4/48 THEN m ELSE n/a – – the P-User-Database private header extension. c31: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c32: IF A.4/70B THEN m ELSE n/a – – inclusion of CANCEL, BYE, REGISTER and PUBLISH in communications resource priority for the session initiation protocol. c35: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE n/a – – IF A.4/71 AND (A.3/9B OR A.3/9C) THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling). c36: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c37: IF A.4/13 THEN m ELSE IF A.4/13A THEN m ELSE n/a – – SIP INFO method and package framework, legacy INFO usage. c38: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c39: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c40: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network. c41: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c42: IF A.4/112 AND A.3/2 THEN o ELSE n/a – – resource sharing, AS. c43: IF A.4/113 AND (A.3/1 OR A.3/4) THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE or S-CSCF. c44: IF A.4/113 AND (A.3/4 OR A.3/7A) THEN m ELSE n/a – – the Cellular-Network-Info header extension and S-CSCF or AS acting as terminating UA. c45: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c46: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE 1: No distinction has been made in these tables between first use of a request on a From/To/Call-ID combination, and the usage in a subsequent one. Therefore the use of "o" etc. above has been included from a viewpoint of first usage. NOTE 2: The strength of this requirement in RFC 7315 [52] is SHOULD NOT, rather than MUST NOT. NOTE 3: Support of this header field in this method is dependent on the security mechanism and the security architecture which is implemented.

Prerequisite A.5/18 – – REGISTER request

Table A.120: Supported message bodies within the REGISTER request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	message/sip	[26] 27.5	n/a	c1	[26] 27.5	n/a	c2
2	3GPP IM CN subsystem XML body	subclause 7.6	n/a	c1	subclause 7.6	n/a	c2
3	application/vnd.3gpp.mcptt-info+xml	[8ZE]	n/a	c3	[8ZE]	n/a	c3
c1: IF A.3/4 THEN o ELSE n/a – – S-CSCF. c2: IF A.3/7 THEN o ELSE n/a – – AS. c3: IF A.3A/102 OR A.3A/103 THEN m ELSE n/a – – MCPTT client, MCPTT server.

Table A.121: Void

Prerequisite A.5/19 – – REGISTER response

Prerequisite: A.6/1 – – Additional for 100 (Trying) response

Table A.121A: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
6	To	[26] 20.39	m	m	[26] 20.39	m	m
7	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses.

Prerequisite A.5/19 – – REGISTER response for all remaining status-codes

Table A.122: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Allow	[26] 20.5	c8	c8	[26] 20.5	m	m
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
1A	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
2	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
3	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
3A	Content-ID	[256] 3.2	o	c15	[256] 3.2	m	c16
4	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
5	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
6	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
7	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
8	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
9	From	[26] 20.20	m	m	[26] 20.20	m	m
9A	Geolocation-Error	[89] 4.3	c10	c10	[89] 4.3	c10	c10
9B	History-Info	[66] 4.1	c9	c9	[66] 4.1	c9	c9
10	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
11	Organization	[26] 20.25	o	o	[26] 20.25	o	o
11A	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c3	n/a	[52] 4.4, [52A] 4, [234] 2	c3	n/a
11B	P-Charging-Function-Addresses	[52] 4.5, [52A] 4	c6	c7	[52] 4.5, [52A] 4	c6	c7
11C	P-Charging-Vector	[52] 4.6, [52A] 4	c4	c5	[52] 4.6, [52A] 4	c4	c5
11E	Privacy	[33] 4.2	c2	n/a	[33] 4.2	c2	n/a
11F	Relayed-Charge	7.2.12	n/a	c14	7.2.12	n/a	c14
11G	Require	[26] 20.32	m	m	[26] 20.32	m	m
11H	Server	[26] 20.35	o	o	[26] 20.35	o	o
11I	Session-ID	[162]	o	c13	[162]	o	c13
12	Timestamp	[26] 20.38	c2	c2	[26] 20.38	m	m
13	To	[26] 20.39	m	m	[26] 20.39	m	m
13A	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
14	Via	[26] 20.42	m	m	[26] 20.42	m	m
15	Warning	[26] 20.43	o (note)	o	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c3: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c4: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c5: IF A.4/36 OR A.3/4 THEN m ELSE n/a – – the P-Charging-Vector header extension (including S-CSCF as registrar). c6: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c7: IF A.4/35 OR A.3/4 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension (including S-CSCF as registrar). c8: IF A.6/18 THEN m ELSE o – – 405 (Method Not Allowed). c9: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c10: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c13: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c14: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c15: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c16: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE: For a 488 (Not Acceptable Here) response, RFC 3261 [26] gives the status of this header field as SHOULD rather than OPTIONAL.

Prerequisite A.5/19 – – REGISTER response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.123: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o	o	[26] 20.1	o	o
1A	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
1B	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
1C	Accept-Resource-Priority	[116] 3.2	c14	c14	[116] 3.2	c14	c14
2	Allow-Events	[28] 8.2.2	c12	c12	[28] 8.2.2	c13	c13
3	Authentication-Info	[26] 20.6	c6	c6	[26] 20.6	c7	c7
5	Contact	[26] 20.10	o	o	[26] 20.10	m	m
5A	Feature-Caps	[190]	c18	c18	[190]	c17	c17
5B	Flow-Timer	[92] 11	c15	c15	[92] 11	c15	c15
5C	P-Associated-URI	[52] 4.1	c8	c9	[52] 4.1	c10	c11
6	Path	[35] 4	c3	c3	[35] 4	c4	c4
7	Security-Server	Subclause 7.2A.7	n/a	x	Subclause 7.2A.7	n/a	c16
8	Service-Route	[38] 5	c5	c5	[38] 5	c5	c5
9	Supported	[26] 20.37	m	m	[26] 20.37	m	m
c1: IF (A.3/4 AND A.4/2) THEN m ELSE n/a. – – S-CSCF acting as registrar. c2: IF A.3/4 OR A.3/1 THEN m ELSE n/a. – – S-CSCF or UE. c3: IF A.4/24 THEN m ELSE n/a – – session initiation protocol extension header field for registering non-adjacent contacts. c4: IF A.4/24 THEN o ELSE n/a – – session initiation protocol extension header field for registering non-adjacent contacts. c5: IF A.4/28 THEN m ELSE n/a – – session initiation protocol extension header field for service route discovery during registration. c6: IF A.4/8 THEN o ELSE n/a – – authentication between UA and registrar. c7: IF A.4/8 THEN m ELSE n/a – – authentication between UA and registrar. c8: IF A.4/2 AND A.4/31 THEN m ELSE n/a – – P-Associated-URI header extension and registrar. c9: IF A.3/1 AND A.4/31 THEN m ELSE n/a – – P-Associated-URI header extension and S-CSCF. c10: IF A.4/31 THEN o ELSE n/a – – P-Associated-URI header extension. c11: IF A.4/31 AND A.3/1 THEN m ELSE n/a – – P-Associated-URI header extension and UE. c12: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c13: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c14: IF A.4/70B THEN m ELSE n/a – – inclusion of CANCEL, BYE, REGISTER and PUBLISH in communications resource priority for the session initiation protocol. c15: IF A.4/57 THEN m ELSE n/a – – managing client initiated connections in SIP. c16: IF A.4/37A THEN m ELSE n/a – – mediasec header field parameter for marking security mechanisms related to media. c17: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c18: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network.

Prerequisite A.5/19 – – REGISTER response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.123A: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	o
2	Response-Source	7.2.17	n/a	c1	7.2.17	n/a	c1
c1: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses?

Prerequisite A.5/19 – – REGISTER response

Prerequisite: A.6/103 OR A.6/35 – – Additional for 3xx or 485 (Ambiguous) response

Table A.124: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Contact	[26] 20.10	o (note)	o	[26] 20.10	m	m

Prerequisite A.5/19 – – REGISTER response

Prerequisite: A.6/14 – – Additional for 401 (Unauthorized) response

Table A.125: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Proxy-Authenticate	[26] 20.27	c1	x	[26] 20.27	c1	x
6	Security-Server	[48] 2	x	x	[48] 2	n/a	c2
10	WWW-Authenticate	[26] 20.44	m	m	[26] 20.44	m	m
c1: IF A.4/8 THEN m ELSE n/a – – support of authentication between UA and registrar. c2: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol.

Prerequisite A.5/19 – – REGISTER response

Table A.126: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
6	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.127: Void

Prerequisite A.5/19 – – REGISTER response

Prerequisite: A.6/20 – – Additional for 407 (Proxy Authentication Required) response

Table A.128: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
5	Proxy-Authenticate	[26] 20.27	c1	x	[26] 20.27	c1	x
9	WWW-Authenticate	[26] 20.44	o	o	[26] 20.44	o	o
c1: IF A.4/8 THEN m ELSE n/a – – support of authentication between UA and registrar.

Prerequisite A.5/19 – – REGISTER response

Prerequisite: A.6/25 – – Additional for 415 (Unsupported Media Type) response

Table A.129: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o.1	o.1	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o.1	o.1	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o.1	o.1	[26] 20.3	m	m
o.1 At least one of these capabilities is supported.

Prerequisite A.5/19 – – REGISTER response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.129A: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70B THEN m ELSE n/a – – inclusion of CANCEL, BYE, REGISTER and PUBLISH in communications resource priority for the session initiation protocol.

Prerequisite A.5/19 – – REGISTER response

Prerequisite: A.6/27 – – Additional for 420 (Bad Extension) response

Table A.130: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
8	Unsupported	[26] 20.40	m	m	[26] 20.40	m	m

Prerequisite A.5/19 – – REGISTER response

Prerequisite: A.6/28 OR A.6/41A – – Additional for 421 (Extension Required), 494 (Security Agreement Required) response

Table A.130A: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Security-Server	[48] 2	c2	c2	[48] 2	c1	c1
c1: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol. c2: IF A.4/37 AND A.4/2 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol and registrar.

Prerequisite A.5/19 – – REGISTER response

Prerequisite: A.6/29 – – Additional for 423 (Interval Too Brief) response

Table A.131: Supported header fields within the REGISTER response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
5	Min-Expires	[26] 20.23	m	m	[26] 20.23	m	m

Table A.132: Void

Prerequisite A.5/19 – – REGISTER response

Table A.133: Supported message bodies within the REGISTER response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

A.2.1.4.13 SUBSCRIBE method

Prerequisite A.5/20 – – SUBSCRIBE request

Table A.134: Supported header fields within the SUBSCRIBE request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o	o	[26] 20.1	m	m
1A	Accept-Contact	[56B] 9.2	c22	c22	[56B] 9.2	c26	c26
2	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
3A	Allow	[26] 20.5	o	o	[26] 20.5	m	m
4	Allow-Events	[28] 8.2.2	o	o	[28] 8.2.2	m	m
5	Authorization	[26] 20.7	c3	c3	[26] 20.7	c3	c3
6	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
6A	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
6B	Cellular-Network-Info	7.2.15	n/a	c48	7.2.15	n/a	c49
6C	Contact	[26] 20.10	m	m	[26] 20.10	m	m
7	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
8	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
8A	Content-ID	[256] 3.2	o	c52	[256] 3.2	m	c53
9	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
10	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
11	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
12	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
13	Date	[26] 20.17	c4	c4	[26] 20.17	m	m
14	Event	[28] 8.2.1	m	m	[28] 8.2.1	m	m
15	Expires	[26] 20.19	o (note 1)	o (note 1)	[26] 20.19	m	m
15A	Feature-Caps	[190]	c46	c46	[190]	c45	c45
16	From	[26] 20.20	m	m	[26] 20.20	m	m
16A	Geolocation	[89] 4.1	c27	c27	[89] 4.1	c27	c27
16B	Geolocation-Routing	[89] 4.2	c27	c27	[89] 4.2	c27	c27
16C	History-Info	[66] 4.1	c25	c25	[66] 4.1	c25	c25
16D	Max-Breadth	[117] 5.8	n/a	c38	[117] 5.8	c39	c39
17	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c41
18	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
18A	Organization	[26] 20.25	o	o	[26] 20.25	o	o
18B	P-Access-Network-Info	[52] 4.4, [234] 2	c12	c13	[52] 4.4, [234] 2	c12	c14
18C	P-Asserted-Identity	[34] 9.1	n/a	c50	[34] 9.1	c6	c6
18D	P-Asserted-Service	[121] 4.1	n/a	c51	[121] 4.1	c32	c32
18E	P-Called-Party-ID	[52] 4.2	x	x	[52] 4.2	c10	c10
18F	P-Charging-Function-Addresses	[52] 4.5	c17	c18	[52] 4.5	c17	c18
18G	P-Charging-Vector	[52] 4.6	c15	c16	[52] 4.6	c15	c16
18I	P-Preferred-Identity	[34] 9.2	c6	c7	[34] 9.2	n/a	n/a
18J	P-Preferred-Service	[121] 4.2	c31	c30	[121] 4.2	n/a	n/a
18K	P-Private-Network-Indication	[134]	c35	c35	[134]	c35	c35
18L	P-Profile-Key	[97] 5	n/a	n/a	[97] 5	n/a	n/a
18M	P-Served-User	[133] 6	c40	c40	[133] 6	c40	c40
18N	P-User-Database	[82] 4	n/a	n/a	[82] 4	n/a	n/a
18O	P-Visited-Network-ID	[52] 4.3	x (note 2)	x	[52] 4.3	c11	n/a
18P	Priority	[26] 20.26	o	o	[26] 20.26	o	o
18Q	Privacy	[33] 4.2	c9	c9	[33] 4.2	c9	c9
19	Proxy-Authorization	[26] 20.28	c5	c5	[26] 20.28	n/a	n/a
20	Proxy-Require	[26] 20.29	o	n/a	[26] 20.29	n/a	n/a
20A	Reason	[34A] 2	c21	c21	[34A] 2	c21	c21
21	Record-Route	[26] 20.30	n/a	c41	[26] 20.30	m	m
21A	Referred-By	[59] 3	c23	c23	[59] 3	c24	c24
21B	Reject-Contact	[56B] 9.2	c22	c22	[56B] 9.2	c26	c26
21C	Relayed-Charge	7.2.12	n/a	c47	7.2.12	n/a	c47
21D	Request-Disposition	[56B] 9.1	c22	c22	[56B] 9.1	c26	c26
22	Require	[26] 20.32	m	m	[26] 20.32	m	m
22A	Resource-Priority	[116] 3.1	c29	c29	[116] 3.1	c29	c29
23	Route	[26] 20.34	m	m	[26] 20.34	n/a	c41
23A	Security-Client	[48] 2.3.1	c19	c19	[48] 2.3.1	n/a	n/a
23B	Security-Verify	[48] 2.3.1	c20	c20	[48] 2.3.1	n/a	n/a
23C	Session-ID	[162]	o	c42	[162]	o	c42
24	Supported	[26] 20.37	o	o	[26] 20.37	m	m
24A	Target-Dialog	[184] 7	c43	c43	[184] 7	c44	c44
25	Timestamp	[26] 20.38	c8	c8	[26] 20.38	m	m
26	To	[26] 20.39	m	m	[26] 20.39	m	m
26A	Trigger-Consent	[125] 5.11.2	c33	c33	[125] 5.11.2	c34	c34
27	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
28	Via	[26] 20.42	m	m	[26] 20.42	m	m
c3: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c4: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c5: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c6: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c7: IF A.3/1 AND A.4/25 THEN o ELSE n/a – – UE and private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c8: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c9: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c10: IF A.4/32 THEN o ELSE n/a – – the P-Called-Party-ID extension. c11: IF A.4/33 THEN o ELSE n/a – – the P-Visited-Network-ID extension. c12: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c13: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c14: IF A.4/34 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c15: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c16: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c17: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c18: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c19: IF A.4/37 OR A.4/37A THEN o ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media (note 3). c20: IF A.4/37 OR A.4/37A THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media. c21: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c22: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c23: IF A.4/43 THEN m ELSE n/a – – the SIP Referred-By mechanism. c24: IF A.4/43 THEN o ELSE n/a – – the SIP Referred-By mechanism. c25: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c26: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c27: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c29: IF A.4/70A THEN m ELSE n/a – – inclusion of MESSAGE, SUBSCRIBE, NOTIFY in communications resource priority for the session initiation protocol. c30: IF (A.3/1 OR A.3A/81) AND A.4/74 THEN o ELSE n/a – – UE, MSC Server enhanced for ICS and SIP extension for the identification of services. c31: IF A.4/74 THEN o ELSE n/a – – SIP extension for the identification of services. c32: IF A.4/74 THEN m ELSE n/a – – SIP extension for the identification of services. c33: IF A.4/75A THEN m ELSE n/a – – a relay within the framework for consent-based communications in SIP. c34: IF A.4/75B THEN m ELSE n/a – – a recipient within the framework for consent-based communications in SIP. c35: IF A.4/77 THEN m ELSE n/a – – the SIP P-Private-Network-Indication private-header (P-Header). c38: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), UE, UE performing the functions of an external attached network. c39: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c40: IF A.4/78 THEN m ELSE n/a – – the SIP P-Served-User private header. c41: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c42: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c43: IF A.4/99 THEN o ELSE n/a – – request authorization through dialog Identification in the session initiation protocol. c44: IF A.4/99 THEN m ELSE n/a – – request authorization through dialog Identification in the session initiation protocol. c45: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c46: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network. c47: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c48: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c49: IF A.4/113 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c50: IF A.4/25 AND (A.3/7B OR A.3/8 OR A.3A/81) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and AS acting as originating UA, MRFC, MSC Server enhanced for ICS. c51: IF A.4/74 AND A.3/7B THEN o ELSE n/a – – SIP extension for the identification of services and AS acting as originating UA. c52: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c53: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE 1: The strength of this requirement is RECOMMENDED rather than OPTIONAL. NOTE 2: The strength of this requirement in RFC 7315 [52] is SHOULD NOT, rather than MUST NOT. NOTE 3: Support of this header field in this method is dependent on the security mechanism and the security architecture which is implemented. Use of this header field in this method is not appropriate to the security mechanism defined by 3GPP TS 33.203 [19].

Prerequisite A.5/20 – – SUBSCRIBE request

Table A.135: Supported message bodies within the SUBSCRIBE request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	application/vnd.3gpp.mcptt-info+xml	[8ZE]	n/a	c1	[8ZE]	n/a	c1
2	application/simple-filter+xml	[243]	o	c1	[243]	n/a	c1
c1 IF A.3A/102 OR A.3A/103 THEN m ELSE n/a – – MCPTT client, MCPTT server.

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/1 – – Additional for 100 (Trying) response

Table A.135A: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
6	To	[26] 20.39	m	m	[26] 20.39	m	m
7	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses.

Prerequisite A.5/21 – – SUBSCRIBE response for all remaining status-codes

Table A.136: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Allow	[26] 20.5	c12	c12	[26] 20.5	m	m
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
1A	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
1B	Cellular-Network-Info	7.2.15	n/a	c19	7.2.15	n/a	c20
2	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
3	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
3A	Content-ID	[256] 3.2	o	c22	[256] 3.2	m	c23
4	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
5	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
6	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
7	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
8	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
9	From	[26] 20.20	m	m	[26] 20.20	m	m
9A	Geolocation-Error	[89] 4.3	c14	c14	[89] 4.3	c14	c14
9B	History-Info	[66] 4.1	c13	c13	[66] 4.1	c13	c13
10	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
10A	Organization	[26] 20.25	o	o	[26] 20.25	o	o
10B	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c5	c6	[52] 4.4, [52A] 4, [234] 2	c5	c7
10C	P-Asserted-Identity	[34] 9.1	n/a	c21	[34] 9.1	c3	c3
10D	P-Charging-Function-Addresses	[52] 4.5, [52A] 4	c10	c11	[52] 4.5, [52A] 4	c10	c11
10E	P-Charging-Vector	[52] 4.6, [52A] 4	c8	c9	[52] 4.6, [52A] 4	c8	c9
10G	P-Preferred-Identity	[34] 9.2	c3	x	[34] 9.2	n/a	n/a
10H	Privacy	[33] 4.2	c4	c4	[33] 4.2	c4	c4
10I	Relayed-Charge	7.2.12	n/a	c18	7.2.12	n/a	c18
10J	Require	[26] 20.32	m	m	[26] 20.32	m	m
10K	Server	[26] 20.35	o	o	[26] 20.35	o	o
10L	Session-ID	[162]	o	c17	[162]	o	c17
11	Timestamp	[26] 20.38	m	m	[26] 20.38	c2	c2
12	To	[26] 20.39	m	m	[26] 20.39	m	m
12A	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
13	Via	[26] 20.42	m	m	[26] 20.42	m	m
14	Warning	[26] 20.43	o (note)	o	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c3: IF A.4/25 THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks. c4: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c5: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c6: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c7: IF A.4/34 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c8: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c9: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c10: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c11: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c12: IF A.6/18 THEN m ELSE o – – 405 (Method Not Allowed). c13: IF A.4/47 THEN m ELSE n/a – – an extension to the session initiation protocol for request history information. c14: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c17: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c18: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c19: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info extension and UE. c20: IF A.4/113 AND (A.3/7A OR A.3/7D) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller. c21: IF A.4/25 AND (A.3/7B OR A.3/8) THEN o ELSE n/a – – private extensions to the Session Initiation Protocol (SIP) for asserted identity within trusted networks and AS acting as originating UA, MRFC. c22: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c23: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE: For a 488 (Not Acceptable Here) response, RFC 3261 [26] gives the status of this header field as SHOULD rather than OPTIONAL.

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.137: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Accept-Resource-Priority	[116] 3.2	c5	c5	[116] 3.2	c5	c5
0B	Allow-Events	[28] 8.2.2	o	o	[28] 8.2.2	m	m
1	Authentication-Info	[26] 20.6	c1	c1	[26] 20.6	c2	c2
1A	Contact	[26] 20.10	m	m	[26] 20.10	m	m
2	Expires	[26] 20.19	m	m	[26] 20.19	m	m
2A	Feature-Caps	[190]	c8	c8	[190]	c7	c7
3	Record-Route	[26] 20.30	m	m	[26] 20.30	m	m


6	Supported	[26] 20.37	m	m	[26] 20.37	m	m
c1: IF A.4/7 THEN o ELSE n/a – – authentication between UA and UA. c2: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c5: IF A.4/70A THEN m ELSE n/a – – inclusion of MESSAGE, SUBSCRIBE, NOTIFY in communications resource priority for the session initiation protocol. c7: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c8: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network.

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.137A: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	o
2	Response-Source	7.2.17	n/a	c1	7.2.17	n/a	c1
c1: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses?

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/103 OR A.6/35 – – Additional for 3xx or 485 (Ambiguous) response

Table A.138: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Contact	[26] 20.10	m (note)	m	[26] 20.10	m	m
NOTE: The strength of this requirement is RECOMMENDED rather than MANDATORY for a 485 response.

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/14 – – Additional for 401 (Unauthorized) response

Table A.139: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
2	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
8	WWW-Authenticate	[26] 20.44	m	m	[26] 20.44	m	m
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/17 OR A.6/23 OR A.6/30 OR A.6/36 OR A.6/42 OR A.6/45 OR A.6/50 OR A.6/51 – – Additional for 404 (Not Found), 413 (Request Entity Too Large), 480 (Temporarily not available), 486 (Busy Here), 500 (Internal Server Error), 503 (Service Unavailable), 600 (Busy Everywhere), 603 (Decline) response

Table A.140: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.141: Void

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/20 – – Additional for 407 (Proxy Authentication Required) response

Table A.142: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
2	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
6	WWW-Authenticate	[26] 20.44	o	o	[26] 20.44	o	o
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Table A.142A: Void

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite A.6/25 – – Additional for 415 (Unsupported Media Type) response

Table A.143: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o.1	o.1	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o.1	o.1	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o.1	o.1	[26] 20.3	m	m
o.1 At least one of these capabilities is supported.

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.143A: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70A THEN m ELSE n/a – – inclusion of MESSAGE, SUBSCRIBE, NOTIFY in communications resource priority for the session initiation protocol.

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/27 – – Additional for 420 (Bad Extension) response

Table A.144: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
5	Unsupported	[26] 20.40	m	m	[26] 20.40	m	m

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/28 OR A.6/41A – – Additional for 421 (Extension Required), 494 (Security Agreement Required) response

Table A.144A: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Security-Server	[48] 2	x	x	[48] 2	c1	c1
c1: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol.

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/29 – – Additional for 423 (Interval Too Brief) response

Table A.145: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
2	Min-Expires	[26] 20.23	m	m	[26] 20.23	m	m

Table A.146: Void

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/29H – – Additional for 470 (Consent Needed) response

Table A.146A: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Permission-Missing	[125] 5.9.3	m	m	[125] 5.9.3	m	m

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/39 – – Additional for 489 (Bad Event) response

Table A.147: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Allow-Events	[28] 8.2.2	m	m	[28] 8.2.2	m	m

Table A.148: Void

Prerequisite A.5/21 – – SUBSCRIBE response

Prerequisite: A.6/46 – – Additional for 504 (Server Time-out) response

Table A.148A: Supported header fields within the SUBSCRIBE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Restoration-Info	subclause 7.2.11	n/a	c1	subclause 7.2.11	n/a	n/a
c1: IF A.4/110 THEN o ELSE n/a – – HSS based P-CSCF restoration.

Prerequisite A.5/21 – – SUBSCRIBE response

Table A.149: Supported message bodies within the SUBSCRIBE response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

A.2.1.4.14 UPDATE method

Prerequisite A.5/22 – – UPDATE request

Table A.150: Supported header fields within the UPDATE request

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o	o	[26] 20.1	m	m
1A	Accept-Contact	[56B] 9.2	c20	c20	[56B] 9.2	c24	c24
2	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
4	Allow	[26] 20.5	o	o	[26] 20.5	m	m
5	Allow-Events	[28] 8.2.2	c2	c2	[28] 8.2.2	c3	c3
6	Authorization	[26] 20.7	c4	c4	[26] 20.7	c4	c4
7	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
8	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
8A	Cellular-Network-Info	7.2.15	n/a	c40	7.2.15	n/a	c41
9	Contact	[26] 20.10	m	m	[26] 20.10	m	m
10	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
11	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
11A	Content-ID	[256] 3.2	o	c43	[256] 3.2	m	c44
12	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
13	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
14	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
15	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
16	Date	[26] 20.17	c5	c5	[26] 20.17	m	m
16A	Feature-Caps	[190]	c37	c37	[190]	c36	c36
17	From	[26] 20.20	m	m	[26] 20.20	m	m
17A	Geolocation	[89] 4.1	c25	c25	[89] 4.1	c25	c25
17B	Geolocation-Routing	[89] 4.2	c25	c25	[89] 4.2	c25	c25
17C	Max-Breadth	[117] 5.8	n/a	c29	[117] 5.8	c30	c30
18	Max-Forwards	[26] 20.22	m	m	[26] 20.22	n/a	c31
19	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
19A	Min-SE	[58] 5	c21	c21	[58] 5	c21	c21
20	Organization	[26] 20.25	o	o	[26] 20.25	o	o
20A	P-Access-Network-Info	[52] 4.4, [234] 2	c11	c12	[52] 4.4, [234] 2	c11	c13
20B	P-Charging-Function-Addresses	[52] 4.5	c16	c17	[52] 4.5	c16	c17
20C	P-Charging-Vector	[52] 4.6	c14	c15	[52] 4.6	c14	c15
20E	P-Early-Media	[109] 8	c26	c26	[109] 8	c26	c26
20EA	Priority-Share	Subclause 7.2.16	n/a	c42	Subclause 7.2.16	n/a	c42
20F	Privacy	[33] 4.2	c6	n/a	[33] 4.2	c6	n/a
21	Proxy-Authorization	[26] 20.28	c10	c10	[26] 20.28	n/a	n/a
22	Proxy-Require	[26] 20.29	o	n/a	[26] 20.29	n/a	n/a
22A	Reason	[34A] 2	c8	c8	[34A] 2	c8	c8
23	Record-Route	[26] 20.30	n/a	c31	[26] 20.30	n/a	c31
23A	Recv-Info	[25] 5.2.3	c34	c34	[25] 5.2.3	c34	c34
23B	Referred-By	[59] 3	c22	c22	[59] 3	c23	c23
23C	Reject-Contact	[56B] 9.2	c20	c20	[56B] 9.2	c24	c24
23D	Relayed-Charge	7.2.12	n/a	c38	7.2.12	n/a	c38
23E	Request-Disposition	[56B] 9.1	c20	c20	[56B] 9.1	c24	c24
24	Require	[26] 20.32	m	m	[26] 20.32	m	m
24A	Resource-Priority	[116] 3.1	c33	c33	[116] 3.1	c33	c33
24B	Resource-Share	Subclause 7.2.13	n/a	c39	Subclause 7.2.13	n/a	c39
25	Route	[26] 20.34	m	m	[26] 20.34	n/a	c31
25A	Security-Client	[48] 2.3.1	c18	c18	[48] 2.3.1	n/a	n/a
25B	Security-Verify	[48] 2.3.1	c19	c19	[48] 2.3.1	n/a	n/a
25C	Session-Expires	[58] 4	c21	c21	[58] 4	c21	c21
25D	Session-ID	[162]	o	c35	[162]	o	c35
26	Supported	[26] 20.37	o	o	[26] 20.37	m	m
27	Timestamp	[26] 20.38	c9	c9	[26] 20.38	m	m
28	To	[26] 20.39	m	m	[26] 20.39	m	m
29	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
30	Via	[26] 20.42	m	m	[26] 20.42	m	m
c2: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c3: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c4: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c5: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c6: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c8: IF A.4/38 THEN o ELSE n/a – – the Reason header field for the session initiation protocol. c9: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c10: IF A.4/8A THEN m ELSE n/a – – authentication between UA and proxy. c11: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c12: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c13: IF A.4/34 AND (A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA, AS acting as third-party call controller or EATF. c14: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c15: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c16: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c17: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c18: IF A.4/37 OR A.4/37A THEN o ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media (note). c19: IF A.4/37 OR A.4/37A THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol or mediasec header field parameter for marking security mechanisms related to media. c20: IF A.4/40 THEN o ELSE n/a – – caller preferences for the session initiation protocol. c21: IF A.4/42 THEN m ELSE n/a – – the SIP session timer. c22: IF A.4/43 THEN m ELSE n/a – – the SIP Referred-By mechanism. c23: IF A.4/43 THEN o ELSE n/a – – the SIP Referred-By mechanism. c24: IF A.4/40 THEN m ELSE n/a – – caller preferences for the session initiation protocol. c25: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c26: IF A.4/66 THEN m ELSE n/a – – the SIP P-Early-Media private header extension for authorization of early media. c29: IF A.4/71 AND (A.3/9B OR A.3/9C OR A.3/13B OR A.3/13C) THEN m ELSE IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – addressing an amplification vulnerability in session initiation protocol forking proxies, IBCF (IMS-ALG), IBCF (Screening of SIP signalling), ISC gateway function (IMS-ALG), ISC gateway function (Screening of SIP signalling), UE, UE performing the functions of an external attached network. c30: IF A.4/71 THEN m ELSE n/a – – addressing an amplification vulnerability in session initiation protocol forking proxies. c31: IF A.3/1 AND NOT A.3C/1 THEN n/a ELSE o – – UE, UE performing the functions of an external attached network. c33: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol. c34: IF A.4/13 THEN m ELSE IF A.4/13A THEN m ELSE n/a – – SIP INFO method and package framework, legacy INFO usage. c35: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c36: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c37: IF A.4/100 AND A.3/1 AND NOT A.3C/1 THEN n/a ELSE IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy, UE, UE performing the functions of an external attached network. c38: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c39: IF A.4/112 THEN o ELSE n/a – – resource sharing. c40: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c41: IF A.4/113 AND (A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller or EATF. c42: IF A.4/114 THEN o ELSE n/a – – priority sharing. c43: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c44: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE: Support of this header field in this method is dependent on the security mechanism and the security architecture which is implemented. Use of this header field in this method is not appropriate to the security mechanism defined by 3GPP TS 33.203 [19].

Prerequisite A.5/22 – – UPDATE request

Table A.151: Supported message bodies within the UPDATE request

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1

Prerequisite A.5/23 – – UPDATE response

Prerequisite: A.6/1 – – Additional for 100 (Trying) response

Table A.151A: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
2	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
3	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
4	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
5	From	[26] 20.20	m	m	[26] 20.20	m	m
6	To	[26] 20.39	m	m	[26] 20.39	m	m
7	Via	[26] 20.42	m	m	[26] 20.42	m	m
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses.

Prerequisite A.5/23 – – UPDATE response for all remaining status-codes

Table A.152: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Allow	[26] 20.5	c11	c11	[26] 20.5	m	m
1	Call-ID	[26] 20.8	m	m	[26] 20.8	m	m
1A	Call-Info	[26] 20.9	o	o	[26] 20.9	o	o
1B	Cellular-Network-Info	7.2.15	n/a	c19	7.2.15	n/a	c20
1C	Contact	[26] 20.10	o	o	[26] 20.10	o	o
2	Content-Disposition	[26] 20.11	o	o	[26] 20.11	m	m
3	Content-Encoding	[26] 20.12	o	o	[26] 20.12	m	m
3A	Content-ID	[256] 3.2	o	c21	[256] 3.2	m	c22
4	Content-Language	[26] 20.13	o	o	[26] 20.13	m	m
5	Content-Length	[26] 20.14	m	m	[26] 20.14	m	m
6	Content-Type	[26] 20.15	m	m	[26] 20.15	m	m
7	CSeq	[26] 20.16	m	m	[26] 20.16	m	m
8	Date	[26] 20.17	c1	c1	[26] 20.17	m	m
9	From	[26] 20.20	m	m	[26] 20.20	m	m
9A	Geolocation-Error	[89] 4.3	c13	c13	[89] 4.3	c13	c13
10	MIME-Version	[26] 20.24	o	o	[26] 20.24	m	m
10A	Organization	[26] 20.25	o	o	[26] 20.25	o	o
10B	P-Access-Network-Info	[52] 4.4, [52A] 4, [234] 2	c4	c5	[52] 4.4, [52A] 4, [234] 2	c4	c6
10C	P-Charging-Function-Addresses	[52] 4.5, [52A] 4	c9	c10	[52] 4.5, [52A] 4	c9	c10
10D	P-Charging-Vector	[52] 4.6, [52A] 4	c7	c8	[52] 4.6, [52A] 4	c7	c8
10F	Privacy	[33] 4.2	c3	n/a	[33] 4.2	c3	n/a
10G	Recv-Info	[25] 5.2.3	c16	c16	[25] 5.2.3	c16	c16
10H	Relayed-Charge	7.2.12	n/a	c18	7.2.12	n/a	c18
10I	Require	[26] 20.31	m	m	[26] 20.31	m	m
10J	Server	[26] 20.35	o	o	[26] 20.35	o	o
10K	Session-ID	[162]	o	c17	[162]	o	c17
11	Timestamp	[26] 20.38	c12	c12	[26] 20.38	c2	c2
12	To	[26] 20.39	m	m	[26] 20.39	m	m
12A	User-Agent	[26] 20.41	o	o	[26] 20.41	o	o
13	Via	[26] 20.42	m	m	[26] 20.42	m	m
14	Warning	[26] 20.43	o (note)	o	[26] 20.43	o	o
c1: IF A.4/11 THEN o ELSE n/a – – insertion of date in requests and responses. c2: IF A.4/6 THEN m ELSE n/a – – timestamping of requests. c3: IF A.4/26 THEN o ELSE n/a – – a privacy mechanism for the Session Initiation Protocol (SIP). c4: IF A.4/34 THEN o ELSE n/a – – the P-Access-Network-Info header extension. c5: IF A.4/34 AND A.3/1 THEN m ELSE n/a – – the P-Access-Network-Info header extension and UE. c6: IF A.4/34 AND (A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the P-Access-Network-Info header extension and AS acting as terminating UA, AS acting as third-party call controller or EATF. c7: IF A.4/36 THEN o ELSE n/a – – the P-Charging-Vector header extension. c8: IF A.4/36 THEN m ELSE n/a – – the P-Charging-Vector header extension. c9: IF A.4/35 THEN o ELSE n/a – – the P-Charging-Function-Addresses header extension. c10: IF A.4/35 THEN m ELSE n/a – – the P-Charging-Function-Addresses header extension. c11: IF A.6/18 THEN m ELSE o – – 405 (Method Not Allowed) c12: IF A.4/6 THEN o ELSE n/a – – timestamping of requests. c13: IF A.4/60 THEN m ELSE n/a – – SIP location conveyance. c16: IF A.4/13 THEN m ELSE IF A.4/13A THEN m ELSE n/a – – SIP INFO method and package framework, legacy INFO usage. c17: IF A.4/91 THEN m ELSE n/a – – the Session-ID header. c18: IF A.4/111 THEN m ELSE n/a – – the Relayed-Charge header field extension. c19: IF A.4/113 AND A.3/1 THEN m ELSE n/a – – the Cellular-Network-Info header extension and UE. c20: IF A.4/113 AND (A.3/7A OR A.3/7D OR A3A/84) THEN m ELSE n/a – – the Cellular-Network-Info header extension and AS acting as terminating UA or AS acting as third-party call controller or EATF. c21: IF A.4/119 THEN o ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP). c22: IF A.4/119 THEN m ELSE n/a – – Content-ID header field in Session Initiation Protocol (SIP).
NOTE: For a 488 (Not Acceptable Here) response, RFC 3261 [26] gives the status of this header field as SHOULD rather than OPTIONAL.

Prerequisite A.5/23 – – UPDATE response

Prerequisite: A.6/102 – – Additional for 2xx response

Table A.153: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
0A	Accept	[26] 20.1	o	o	[26] 20.1	m	m
0B	Accept-Encoding	[26] 20.2	o	o	[26] 20.2	m	m
0C	Accept-Language	[26] 20.3	o	o	[26] 20.3	m	m
0D	Accept-Resource-Priority	[116] 3.2	c14	c14	[116] 3.2	c14	c14
1	Allow-Events	[28] 8.2.2	c4	c4	[28] 8.2.2	c5	c5
2	Authentication-Info	[26] 20.6	c1	c1	[26] 20.6	c2	c2
3	Contact	[26] 20.10	m	m	[26] 20.10	m	m
3A	Feature-Caps	[190]	c16	c16	[190]	c16	c16
3B	P-Early-Media	[109] 8	c6	c6	[109] 8	c6	c6
3C	Priority-Share	Subclause 7.2.16	n/a	c18	Subclause 7.2.16	n/a	c18
3E	Resource-Share	Subclause 7.2.13	n/a	c17	Subclause 7.2.13	n/a	c17
4	Session-Expires	[58]	c3	c3	[58]	c3	c3
6	Supported	[26] 20.37	m	m	[26] 20.37	m	m
c1: IF A.4/7 THEN o ELSE n/a – – authentication between UA and UA. c2: IF A.4/7 THEN m ELSE n/a – – authentication between UA and UA. c3: IF A.4/42 THEN m ELSE n/a – – the SIP session timer c4: IF A.4/22 THEN o ELSE n/a – – acting as the notifier of event information. c5: IF A.4/23 THEN m ELSE n/a – – acting as the subscriber to event information. c6: IF A.4/66 THEN m ELSE n/a – – the SIP P-Early-Media private header extension for authorization of early media. c14: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol. c16: IF A.4/100 THEN m ELSE n/a – – indication of features supported by proxy. c17: IF A.4/112 THEN o ELSE n/a – – resource sharing. c18: IF A.4/114 THEN o ELSE n/a – – priority sharing.

Prerequisite A.5/23 – – UPDATE response

Prerequisite: A.6/103 OR A.6/104 OR A.6/105 OR A.6/106 – – Additional for 3xx – 6xx response

Table A.153A: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Error-Info	[26] 20.18	o	o	[26] 20.18	o	o
2	Response-Source	7.2.17	n/a	c1	7.2.17	n/a	c1
c1: IF A.4/115 THEN o ELSE n/a – – use of the Response-Source header field in SIP error responses?

Prerequisite A.5/23 – – UPDATE response

Prerequisite: A.6/103 OR A.6/35 – – Additional for 3xx, 485 (Ambiguous) response

Table A.154: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
2	Contact	[26] 20.10	o	o	[26] 20.10	o	o

Prerequisite A.5/23 – – UPDATE response

Prerequisite: A.6/14 – – Additional for 401 (Unauthorized) response

Table A.154A: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
6	WWW-Authenticate	[26] 20.44	m	m	[26] 20.44	m	m
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/23 – – UPDATE response

Table A.155: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
5	Retry-After	[26] 20.33	o	o	[26] 20.33	o	o

Table A.156: Void

Prerequisite A.5/23 – – UPDATE response

Prerequisite: A.6/20 – – Additional for 407 (Proxy Authentication Required) response

Table A.157: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
4	Proxy-Authenticate	[26] 20.27	c1	c1	[26] 20.27	c1	c1
8	WWW-Authenticate	[26] 20.44	o	o	[26] 20.44	o	o
c1: IF A.4/7 THEN m ELSE n/a – – support of authentication between UA and UA.

Prerequisite A.5/23 – – UPDATE response

Prerequisite: A.6/25 – – Additional for 415 (Unsupported Media Type) response

Table A.158: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept	[26] 20.1	o.1	o.1	[26] 20.1	m	m
2	Accept-Encoding	[26] 20.2	o.1	o.1	[26] 20.2	m	m
3	Accept-Language	[26] 20.3	o.1	o.1	[26] 20.3	m	m
o.1 At least one of these capabilities is supported.

Prerequisite A.5/23 – – UPDATE response

Prerequisite: A.6/26A – – Additional for 417 (Unknown Resource-Priority) response

Table A.158A: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Accept-Resource-Priority	[116] 3.2	c1	c1	[116] 3.2	c1	c1
c1: IF A.4/70 THEN m ELSE n/a – – communications resource priority for the session initiation protocol.

Prerequisite A.5/23 – – UPDATE response

Prerequisite: A.6/27 – – Additional for 420 (Bad Extension) response

Table A.159: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
7	Unsupported	[26] 20.40	m	m	[26] 20.40	m	m

Prerequisite A.5/23 – – UPDATE response

Prerequisite: A.6/28 OR A.6/41A – – Additional for 421 (Extension Required), 494 (Security Agreement Required) response

Table A.159A: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
3	Security-Server	[48] 2	x	x	[48] 2	c1	c1
c1: IF A.4/37 THEN m ELSE n/a – – security mechanism agreement for the session initiation protocol.

Prerequisite A.5/23 – – UPDATE response

Prerequisite: A.6/28A – – Additional for 422 (Session Interval Too Small) response

Table A.159B: Supported header fields within the UPDATE response

Item	Header field	Sending			Receiving
Item	Header field	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1	Min-SE	[58] 5	c1	c1	[58] 5	c1	c1
c1: IF A.4/42 THEN m ELSE n/a – – the SIP session timer.

Table A.160: Void

Prerequisite A.5/23 – – UPDATE response

Table A.161: Supported message bodies within the UPDATE response

Item	Header	Sending			Receiving
Item	Header	Ref.	RFC status	Profile status	Ref.	RFC status	Profile status
1