5.0a Session-unrelated procedures

23.2283GPPIP Multimedia Subsystem (IMS)Release 18Stage 2TS

The IM CN Subsystem provides means to conduct session-unrelated interactions between users, e.g. OPTIONS query, outband REFER. These interactions are described in IETF RFC 3261 [12], and other possible IETF RFCs. The generic capability exchange mechanism is defined in TS 23.279 [52].

These interactions shall use and fully comply with the basic mechanisms described for session-related procedures of the IM CN Subsystem. These mechanisms include e.g. routing, security, service control, network hiding as described in other clauses and specifications.