6a.4.1 Controller UE initiated add new media on Controller UE

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

UE-1, UE-2 are engaged in a Collaborative Session established using procedures shown in clause 6a.2 for which UE-1 is the Controller UE and UE-2 is a Controllee UE, which has a media flow-A with the remote party. The following flows shows how the Controller UE-1 adds a media flow-B to itself, which may result in a new Access Leg, or it could be an additional media flow for an already existing session for the Controller UE-1.

Figure 6a.4.1-1: Controller UE initiated add new media On Controller UE

1. Controller UE-1 decides to add a new media flow-B to itself, and performs an IUT add media request for the particular media requested. The IUT media transfer request shall include enough information for the SCC AS to:

– identify that the added media flow is media flow-B;

– identify that the target of the added media flow is the Controller UE-1 itself;

2. The SCC AS performs authorization as specified in clause 6a.12. Then, the new media flow-B is setup for Controller UE-1, and the Remote Leg is updated as well with the newly added media flow-B using the Remote Leg Update procedure as specified in clause 6a.1.2. After this, the new media flow-B will be established between the Controller UE-1 and the Remote Party.

3. The IUT addition of media is completed.