6a.4.8 Remote party initiated release media

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

The following is an example of an information flow where remote party wants to remove 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.4.8-1: Remote party initiated release media

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

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

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

Steps 2b and 3b are for the case the released media is bound to Controllee UE.

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

NOTE 1: If no more media remains on the Access Leg between SCC AS and Controllee UE-2, this Access Leg is released and Controllee UE-2 will no longer be part of the Collaborative Session.

3b. SCC AS informs Controller UE-1 that the Media Flow-B on UE-2 was removed.

NOTE 2: If no more Controllee UE remains after the media removal, the Collaborative Session is terminated and there will be a general IMS session between UE-1 and remote party.