IP Multimedia Subsystem (IMS) Application Server (AS) Services Stage 3
The present document specifies the stage 3 protocol and data model for the Nimsas Service Based Interface. It provides stage 3 protocol definitions and message flows, and specifies the API for each service offered by the IMS AS.
The 5G System stage 2 architecture and procedures are specified in TS 23.501 [2] and TS 23.502 [3].
The IP Multimedia Subsystem (IMS) supporting DC architecture and procedures are specified in TS 23.228 [14].
The Technical Realization of the Service Based Architecture and the Principles and Guidelines for Services Definition are specified in TS 29.500 [4] and TS 29.501 [5].