This document describes how media stream selection can be achieved in
both a conferencing scenario and peer to peer communication. To
allow endpoints to select specific media streams, all available media
in the session must be identifiable and there is a need for messages
than can be securely transported between endpoints and network nodes.
This document also describes a way to distribute the identification
information to all participating endpoints. The necessary messages
can potentially be mapped onto several different encodings, and this
document proposes one mapping that uses an extended version of the
Binary Floor Control Protocol.