Real-time Transport Protocol (RTP) is a flexible protocol possible to
use in a wide range of applications and network and system
topologies. This flexibility and the implications of different
choices should be understood by any application developer using RTP.
To facilitate that understanding, this document contains an in-depth
discussion of the usage of RTP's multiplexing points; the RTP session
and the Synchronisation Source Identifier (SSRC). The document tries
to give guidance and source material for an analysis on the most
suitable choices for the application being designed.