A.23 eCall Setup and MSD Update / 5GS
34.229-53GPPInternet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP)Part 5: Protocol conformance specification using 5G System (5GS)Release 16TSUser Equipment (UE) conformance specification
Expected sequence
|
Step |
Direction |
Message/Procedure |
Comment |
|
|
UE |
SS |
|||
|
1 |
🡪 |
INVITE |
UE sends INVITE with initial MSD |
|
|
2 |
🡨 |
200 OK |
SS responds INVITE with 200 OK |
|
|
3 |
🡪 |
ACK |
UE responds ACK for 200 OK |
|
|
4 |
🡨 |
SIP INFO |
SS sends SIP INFO to request MSD update |
|
|
5 |
🡪 |
200 OK |
UE responds SIP INFO with 200 OK |
|
|
6 |
🡪 |
SIP INFO |
UE sends SIP INFO with MSD update |
|
|
7 |
🡨 |
200 OK |
SS responds SIP INFO with 200 OK. |
|
Specific message contents:
INVITE (Step 1)
Use the default message "INVITE for MO Call Setup" in Annex A.2.1 of TS 34.229-1 [2] applying condition A7 and condition A20 or A21 as indicated by the test case and the following inclusion along with the applicable message body of default message:
|
Header/param |
Value/remark |
|
Message-body |
The following SDP types and values. Session description: – – v=0 – o=(username) (sess-id) (sess-version) IN (addrtype) (unicast-address for UE) – s=(session name) – c=IN (addrtype) (connection-address for UE) [Note 1] Time description: – t= (start-time) (stop-time) Media description: – m=audio (transport port) [Note 2] – c=IN (addrtype) (connection-address for UE) [Note 1] – b=AS: (bandwidth-value) Note 1: At least one "c=" field shall be present. Note 2: EVS codec shall be present in the media attributes, optionally including channel number "/1". |
200 OK for INVITE (Step 2)
Use the default message “200 OK for other requests than REGISTER or SUBSCRIBE” in Annex A.3.1 of TS 34.229-1 [2] with conditions A6, A12, (A13 OR A14) and A22 and following inclusion along with the applicable message body of default message:
|
Header/param |
Value/remark |
|
Content-Type media-type |
application/sdp |
|
Content-Length value |
length of message-body |
|
Message-body |
The following SDP types and values. Session description: v=0 o=- 1111111111 1111111111 IN (addrtype) (unicast-address for SS) s=- c=IN (addrtype) (connection-address for SS) b=AS:37 Time description: t=0 0 Media description: m=audio (transport port) RTP/AVP (fmt) [Note 1] b=AS:37 b=RS:0 b=RR:0 Attributes for media: a=rtpmap: (payload type) EVS/16000/1 [Note 1] a=fmtp: (format) mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 Note 1: The value for fmt, payload type and format is copied from step 1. |
INFO (Step 4)
Use the default message “INFO for MT” in Annex A.2.20 of TS 34.229-1 [2].
INFO (Step 6)
Use the default message “INFO for MO” in Annex A.2.19 of TS 34.229-1 [2].