B.13 REFER method

29.1653GPPInter-IMS Network to Network Interface (NNI)Release 18TS

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

As described in table 6.1, the support of REFER method over the II-NNI is based on bilateral agreement between the operators.

The table B.13.1 lists the supported header fields within the REFER request.

Table B.13.1: Supported header fields within the REFER request

Item	Header field	Ref.	RFC status	II-NNI condition
1	Accept	[13], [22]	o	do
2	Accept-Contact	[51]	o	IF dc1 (PNM: clause 12.17) THEN dm ELSE do
3	Accept-Encoding	[13], [22]	o	do
4	Accept-Language	[13], [22]	o	do
5	Additional-Identity	[5]	n/a	IF table 6.1.3.1/126 THEN do (NOTE)
6	Allow	[13], [22]	o	do
7	Allow-Events	[20]	o	IF table 6.1.3.1/23 THEN do (NOTE)
8	Authorization	[13], [22]	o	IF table 6.1.3.1/7 THEN do (NOTE)
9	Call-ID	[13], [22]	m	dm
10	Cellular-Network-Info	[5]	n/a	IF table 6.1.3.1/117 THEN do (NOTE)
11	Contact	[13], [22]	m	dm
12	Content-Disposition	[13], [22]	o	do
13	Content-Encoding	[13], [22]	o	do
14	Content-ID	[216]	o	IF table 6.1.3.1/122 THEN do
15	Content-Language	[13], [22]	o	do
16	Content-Length	[13], [22]	o	do
17	Content-Type	[13], [22]	*	d*
18	CSeq	[13], [22]	m	dm
19	Date	[13], [22]	o	do
20	Expires	[13], [22]	o	do
21	Feature-Caps	[143]	o	IF table 6.1.3.1/103 AND request outside an existing dialog THEN do (NOTE)
22	From	[13], [22]	m	dm
23	Geolocation	[68]	o	do
24	Geolocation-Routing	[68]	o	do
25	History-Info	[25]	o	IF dc1 (PNM: clause 12.17) THEN dm ELSE IF table 6.1.3.1/50 AND request outside an existing dialog THEN do (NOTE)
26	Max-Breadth	[79]	o	do
27	Max-Forwards	[13], [22]	m	dm
28	MIME-Version	[13], [22]	o	do
29	Organization	[13], [22]	o	do
30	P-Access-Network-Info	[24], [24B]	o	IF table 6.1.3.1/36 THEN do (NOTE)
31	P-Asserted-Identity	[44]	o	IF table 6.1.3.1/27 AND request outside an existing dialog THEN dm (NOTE)
32	P-Asserted-Service	[26]	o	IF (non-roaming II-NNI OR home-to-visited request on roaming II-NNI) AND table 6.1.3.1/77 AND request outside an existing dialog THEN do (NOTE)
33	P-Called-Party-ID	[24], [24A]	o	IF home-to-visited request on roaming II-NNI AND table 6.1.3.1/34 THEN do (NOTE)
34	P-Charging-Function-Addresses	[24]	o	dn/a
35	P-Charging-Vector	[24]	o	IF table 6.1.3.1/38 AND request outside an existing dialog THEN dm (NOTE)
36	P-Preferred-Identity	[44]	o	dn/a
37	P-Preferred-Service	[26]	o	IF visited-to-home request on roaming II-NNI AND table 6.1.3.1/77 AND request outside an existing dialog THEN do (NOTE)
38	P-Private-Network-Indication	[84]	o	IF table 6.1.3.1/80 AND request outside an existing dialog THEN do (NOTE)
39	P-Profile-Key	[64]	o	IF table 6.1.3.1/59 AND request outside an existing dialog THEN do (NOTE)
40	P-Served-User	[85]	o	IF visited-to-home request on roaming II-NNI AND request outside an existing dialog being sent from "privileged sender" THEN dm (NOTE)
41	P-User-Database	[60]	o	dn/a
42	P-Visited-Network-ID	[24]	o	dn/a
43	Privacy	[34]	o	IF dc2 (OIP/OIR: clause 12.3) OR dc3 (ECT: clause 12.13) THEN dm ELSE do
44	Proxy-Authorization	[13], [22]	o	IF table 6.1.3.1/7 THEN do (NOTE)
45	Proxy-Require	[13], [22]	o	do
46	Reason	[48]	o	IF table 6.1.3.1/40 AND request inside an existing dialog THEN do (NOTE)
47	Record-Route	[13], [22]	o	do
48	Refer-Sub	[135]	o	do
49	Refer-To	[22]	dm	dm
50	Referred-By	[53]	o	IF dc4 (ECT: clause 12.13) THEN dm ELSE do
51	Reject-Contact	[51]	o	do
52	Relayed-Charge	[5]	n/a	dn/a
53	Request-Disposition	[51]	o	do
54	Require	[13], [22]	c	dc
55	Resource-Priority	[78]	o	IF table 6.1.3.1/73 THEN do (NOTE)
56	Route	[13], [22]	c	dc
57	Security-Client	[47]	o	dn/a
58	Security-Verify	[47]	o	dn/a
59	Session-ID	[124]	m	IF table 6.1.3.1/94 THEN dm (NOTE)
60	Supported	[13], [22]	o	IF dc1 (PNM: clause 12.17) THEN dm ELSE do
61	Target-Dialog	[140]	o	IF table 6.1.3.1/102 THEN do (NOTE)
62	Timestamp	[13], [22]	o	do
63	To	[13], [22]	m	dm
64	Trigger-Consent	[82]	o	IF table 6.1.3.1/78 THEN do (NOTE)
65	User-Agent	[13], [22]	o	do
66	Via	[13], [22]	m	dm
dc1: request outside an existing dialog invoked due to PNM in case of ("PN UE redirection" OR "PN access control") AND (non-roaming II-NNI OR home-to-visited request on roaming II-NNI) dc2: (request outside an existing dialog invoked due to OIP/OIR AND "override the default setting" in temporary mode AND visited-to-home request on roaming II-NNI) OR (request outside an existing dialog invoked due to OIP/OIR AND "presentation of the public user identity is restricted" AND (non-roaming II-NNI OR home-to-visited request on roaming II-NNI)) dc3: request inside an existing dialog invoked due to ECT including Referred-By header field with privacy requested in the "original communication" dc4: request inside an existing dialog invoked due to ECT AND (non-roaming II-NNI OR loopback traversal scenario OR home-to-visited request on roaming II-NNI)
NOTE: If the capability specified in table 6.1.3.1 is not supported over the II-NNI, the IBCF in the receiving network can omit or modify the SIP header fields in the received SIP message prior to forwarding the SIP message as specified in 3GPP TS 24.229 [5] clause 5.10.6.2.

The table B.13.2 lists the supported header fields within the REFER response.

Table B.13.2: Supported header fields within the REFER response

Item	Header field	SIP status code	Ref.	RFC status	II-NNI condition
1	Accept	415	[13], [22]	c	dc
2	Accept-Encoding	415	[13], [22]	c	dc
3	Accept-Language	415	[13], [22]	c	dc
4	Accept-Resource-Priority	2xx 417	[78]	o	IF table 6.1.3.1/73 THEN do (NOTE 2)
5	Allow	405	[13], [22]	m	dm
5	Allow	others	[13], [22]	o	do
6	Allow-Events	2xx	[20]	o	IF table 6.1.3.1/23 THEN do (NOTE 2)
7	Authentication-Info	2xx	[13], [22]	o	IF table 6.1.3.1/7 THEN do (NOTE 2)
8	Call-ID	100 others	[13], [22]	m	dm
9	Cellular-Network-Info	r	[5]	n/a	IF table 6.1.3.1/117 THEN do (NOTE 2)
10	Contact	2xx	[13], [22]	m	dm
10	Contact	3xx-6xx	[13], [22]	o	do
11	Content-Disposition	r	[13], [22]	o	do
12	Content-Encoding	r	[13], [22]	o	do
13	Content-ID	r	[216]	o	IF table 6.1.3.1/122 THEN do
14	Content-Language	r	[13], [22]	o	do
15	Content-Length	100 others	[13], [22]	t	dt
16	Content-Type	r	[13], [22]	*	d*
17	CSeq	100 others	[13], [22]	m	dm
18	Date	100 others	[13], [22]	o	do
19	Error-Info	3xx-6xx	[13], [22]	o	IF table 6.1.3.1/13 THEN do (NOTE 2)
20	Feature-Caps	2xx	[143]	o	IF table 6.1.3.1/103 AND response to request outside an existing dialog THEN do (NOTE 2)
21	From	100 others	[13], [22]	m	dm
22	Geolocation-Error	424	[68]	m	dm
22	Geolocation-Error	others	[68]	o	do
23	History-Info	r	[25]	o	IF table 6.1.3.1/50 AND response to request outside an existing dialog THEN do (NOTE 2)
24	MIME-version	r	[13], [22]	o	do
25	Organization	r	[13], [22]	o	do
26	P-Access-Network-Info	r	[24], [24A], [24B]	o	IF table 6.1.3.1/36 THEN do (NOTE 2)
27	P-Asserted-Identity	r	[44]	o	IF dc1 (TIP/TIR: clause 12.4) THEN dm ELSE IF table 6.1.3.1/27 AND response to request outside an existing dialog THEN do (NOTE 2)
28	P-Charging-Function-Addresses	r	[24], [24A]	o	dn/a
29	P-Charging-Vector	100	24], [24A]	o	dn/a
		18x, 2xx		o	IF dc2 (CONF: clause 12.19) OR (table 6.1.3.1/38 AND response to request outside an existing dialog) THEN dm (NOTE 2)
		3xx-6xx		o	do (NOTE 2)
30	P-Preferred-Identity	r	[44]	o	dn/a
31	Permission-Missing	470	[82]	o	IF table 6.1.3.1/78 THEN do (NOTE 2)
32	Privacy	r	[34]	o	IF dc3 (TIP/TIR: clause 12.4) THEN dm ELSE do
33	Proxy-Authenticate	401 (NOTE 1)	[13], [22]	o	do
33	Proxy-Authenticate	407 (NOTE 1)	[13], [22]	m	dm
34	Record-Route	2xx	[13], [22]	o	do
35	Refer-Sub	2xx	[135]	o	IF table 6.1.3.1/98 THEN do (NOTE 2)
36	Relayed-Charge	r	[5]	n/a	dn/a
37	Require	r	[13], [22]	c	dc
38	Response-Source	3xx-6xx	[5]	n/a	IF table 6.1.3.1/121 THEN do (NOTE 2)
39	Restoration-Info	504	[5]	n/a	IF table 6.1.3.1/114 AND visited-to-home response on roaming II-NNI THEN do (NOTE 2)
40	Retry-After	404 413 480 486 500 503 600 603	[13], [22]	o	do
41	Security-Server	421 494	[47]	o	dn/a
42	Server	r	[13], [22]	o	do
43	Session-ID	r	[124]	m	IF table 6.1.3.1/94 THEN dm (NOTE 2)
44	Supported	2xx	[13], [22]	o	do
45	Timestamp	r	[13], [22]	o	do
46	To	100 others	[13], [22]	m	dm
47	Unsupported	420	[13], [22]	o	do
48	User-Agent	r	[13], [22]	o	do
49	Via	100 others	[13], [22]	m	dm
50	Warning	r	[13], [22]	o	do
51	WWW-Authenticate	401 (NOTE 1)	[13], [22]	m	dm
51	WWW-Authenticate	407 (NOTE 1)	[13], [22]	o	do
dc1: (TIP/TIR AND 2xx response to request outside an existing dialog AND (visited-to-home response on roaming II-NNI OR non-roaming II-NNI)) OR (TIP/TIR AND response to request outside an existing dialog AND "presentation is allowed" AND home-to-visited response on roaming II-NNI) dc2: first response from "conference focus" to request outside an existing dialog AND (non-roaming II-NNI OR home-to-visited response on roaming II-NNI) dc3: (TIP/TIR AND non-100 response to request outside an existing dialog AND "override the default setting" in temporary mode AND visited-to-home response on roaming II-NNI) OR (TIP/TIR AND 2xx response to request outside an existing dialog AND "presentation of the network asserted identity is restricted" AND (non-roaming II-NNI OR home-to-visited response on roaming II-NNI))
NOTE 1: The SIP status code is only applicable over the roaming II-NNI. NOTE 2: If the capability specified in table 6.1.3.1 is not supported over the II-NNI, the IBCF in the receiving network can omit or modify the SIP header fields in the received SIP message prior to forwarding the SIP message as specified in 3GPP TS 24.229 [5] clause 5.10.6.2.