6a.0 Introduction
23.2373GPPIP Multimedia Subsystem (IMS) Service ContinuityRelease 17Stage 2TS
In the following procedures and flows the UEs involved in IUT are labelled as UE-1, UE-2, etc. while the remote endpoint of the session is labelled as Remote Party. Flows are shown for IUT procedures establishing Collaborative Sessions as well as IUT procedures without establishing a Collaborative Session.
In the following information flows, when initiating IUT Media Control Related Procedures, the Controller UE can be replaced by the Controllee UE with IUT capabilities, with the difference that the Hosting SCC AS receiving a media control request from a Controllee UE with IUT capabilities shall send it to the Controller UE for authorization, or authorize it on behalf of the Controller UE (e.g. based on the user preferences associated with the Controller UE).
These information flows exemplify IUT procedures initiated by a UE sending a request received by the SCC AS. Scenarios pertaining to the SCC AS initiating IUT procedures based on different stimuli such as user preferences, other IMS signalling or service layer triggers are not precluded, but illustrative information flows are not included in this document except for the case of loss of Controller UE.
For the enablement of Inter-UE Transfer, originating and terminating sessions (without Collaborative Session establishment) are handled as specified in clause 6.2.