1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 System overview
6.1 Architecture framework
6.2 Session control
6.3 Media transmission
6.4 Example of the sequence
7 Session control
7.1 Authentication
7.2 Registration
7.3 Starting a session
7.4 Closing a session
7.5 Cancelling a request
8 Media transmission
8.1 Profiles
8.2 Codecs
8.3 Codec profile selection in set-up – UE procedures
8.4 Packet format
8.5 Transport
8.6 Real-time text support (optional)