The present document contains the study on Telepresence using IP Multimedia (IM) Core Network (CN) subsystem based on the Session Initiation Protocol (SIP), Session Description Protocol (SDP) and other protocols of controlling multiple streams for Telepresence based on service requirements. The study aims, within the defined CT1 work areas, at:

• analysing IMS session procedures and signalling between the UE and core network for Telepresence creation, establishment with media negotiation and configuration, session modification and termination, with the incorporation of new protocol (i.e. CLUE as under developing in IETF);
• investigating impacts for presentation in Telepresence and floor control in IMS;
• analysing similar impacts to allow legacy devices interworked with Telepresence using IMS; and
• studying potential enhancements and extensions to facilitate these procedures.

This study will identify specification areas, if any, that lie within the scope of other 3GPP working groups, and seek input from those 3GPP working groups to define that related specification work.

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

• References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
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• For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.