This TS provides the protocol details for the presence service within the IP Multimedia (IM) Core Network (CN) subsystem based on the Session Initiation Protocol (SIP) and SIP Events as defined in ETSI ES 283 003.
Where possible this TS specifies the requirements for this protocol by reference to specifications produced by the IETF within the scope of SIP and SIP Events, either directly, or as modified by ETSI ES 283 003.
The Presence XDMS and Resource List Server (RLS) specific data formats and XCAP application usages are within the scope of this TS. These are used within the context of the generic XDM capability described in TS 183 038.
This TS is applicable to Application Servers (ASs) and User Equipment (UE) providing presence functionality.