9 Interworking

26.2233GPPMedia handling and interactionRelease 18Telepresence using the IP Multimedia Subsystem (IMS)TS

The requirements to enable transcoder-free interworking between TP UEs and MTSI UEs are specified in clause 6.

The interworking requirements for MTSI clients in terminals specified in TS 26.114 [2], clause 12, also apply for TP UEs, for both the basic media streams (non-CLUE-controlled) as well as the CLUE-controlled media streams, latter being applicable when the remote terminal is also CLUE-capable.

When the TP UE falls back to MTSI UE (e.g. upon failure of CLUE capability negotiation during the initial SDP offer-answer exchange), TP UE shall conform to the interworking requirements established for MTSI UEs in clause 12 of TS 26.114 [2].

The interworking requirements for MTSI clients in terminals using fixed access specified in TS 26.114 [2], clause 18, also apply for TP UEs in terminals using fixed access, for both the basic media streams (non-CLUE-controlled) as well as the CLUE-controlled media streams, latter being applicable when the remote terminal is also CLUE-capable.

If the TP UE is in terminal using fixed access, and it falls back to MTSI UE using fixed access (e.g. upon failure of CLUE capability negotiation during the initial SDP offer-answer exchange), TP UE shall conform to the interworking requirements established for MTSI UEs in clause 18 of TS 26.114 [2].

Interworking with non-3GPP telepresence systems, e.g. those based on ITU-T Telepresence [39]-[43], [22], [24] is FFS.