1 Scope
2 References
3 Definitions and abbreviations
3.1 Definitions
3.2 Abbreviations
4 Architecture and information flows for IM multimedia session
5 Functional requirements of network entities
6 Functional requirements of serving CSCF
6.1 Modes of operation of the S-CSCF
6.2 Interfaces defined for S-CSCF
6.3 Handling of SIP registration
6.4 Handling of mobile originating requests
6.5 Handling of mobile terminating requests
6.6 Handling of IP multimedia session release requests
6.7 Handling of subscription and notification
6.8 S-CSCF handling IMS charging
6.9 Description of subscriber data