A.16 Signalling flows for collaborative session media modification

24.3373GPPIP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) inter-UE transferRelease 17Stage 3TS

A.16.1 Introduction

The signalling flow in this subclause demonstrate how a controllee UE initiated media modification on itself.

Figure 4.11.2.2-1: Controllee UE initiated media modification on itself

NOTE: For clarity, the SIP 100 (Trying) responses are not shown in the signalling flow.

1-4. SIP re-INVITE request (UE-2 to SCC AS-1) – see example in table 4.11.2.2-2

The UE-2 sends SIP re-INVITE request to remote UE to modify the media on itself.

Table 4.11.2.2-1: SIP re-INVITE request (UE-2 to Intermediate IM CN subsystem entities)

INVITE sip:remoteuser@home1.net; SIP/2.0

Via: SIP/2.0/UDP [5555::aaa:bbb:ccc:eee]:1357;comp=sigcomp;branch=z9hG4bKnashds7dfdsdq

Max-Forwards: 70

P-Preferred-Identity: <sip:user2@home1.net>

From: <sip:user2@home1.net>;tag=171828

To: <sip:remoteuser@home1.net>;tag=986765

Call-ID: Asdasd23123366

Cseq: 41277 INVITE

Contact: <sip:user2@home1.net;gr=urn:uuid:f81d4fae-7dec-11d0-2222-222222222222>

Allow: INVITE, ACK, CANCEL, BYE, PRACK, UPDATE, REFER, MESSAGE

Content-Type: application/sdp

Content-Length: (…)

v=0

o=- 2987933615 2987933615 IN IP6 4444::aaa:bbb:ccc:eee

s=-

c=IN IP6 4444::aaa:bbb:ccc:eee

t=0 0

m=audio 4444 RTP/AVP 97

a=rtpmap:97 PCMU/8000

5. Authorizes the request for media modification.

6-7. SIP re-INVITE request (SCC AS-1 to remote UE)

After successful authorization, SCC AS-1 sends the SIP re-INVITE to the remote UE.

8-13. SIP 200 (OK) response for the SIP re-INVITE request (Remote UE to UE-2)

Remote UE responds with SIP 200 (OK) response to UE-2.

14-19. SIP ACK request (UE-2 to remote UE)

The UE-2 sends the SIP ACK request to remote UE.

Annex B (normative):
Media feature tags and feature-capability indicators defined within the current document