6a.4.9 Remote party initiated media modification

23.2373GPPIP Multimedia Subsystem (IMS) Service ContinuityRelease 17Stage 2TS

A Collaborative Session is already established using procedures shown in clause 6a.2. The following is an example of an information flow where remote party wants to modify one of media flows, Media Flow-B from an ongoing session. In this information flow, UE-1 and UE-2 belong to the same user subscription. UE-1 is a Controller UE and UE-2 is a Controllee UE.

Figure 6a.4.9-1: Remote party initiated media modification

1. Remote party uses standard IMS procedures defined in TS 23.228 [4] to modify Media Flow-B from the session.

Step 2a is for the case the modified media is bound to Controller UE.

2a. The modification of Media Flow-B between Controller UE-1 and remote party is completed.

Steps 2b – 3b are for the case the modified media is bound to Controllee UE.

2b. The modification of Media Flow-B between Controllee UE-2 and remote party is completed.

3b. If the media modification is hold or resume, SCC AS informs Controller UE-1 that the Media Flow-B on UE-2 was modified.