Ali Begen, Colin Perkins, Dan Wing, and Eric Rescorla
Internet Engineering Task Force,
RFC 7022,
September 2013.
DOI:10.17487/RFC7022
The RTP Control Protocol (RTCP) Canonical Name (CNAME) is a
persistent transport-level identifier for an RTP endpoint. While the
Synchronization Source (SSRC) identifier of an RTP endpoint may
change if a collision is detected or when the RTP application is
restarted, its RTCP CNAME is meant to stay unchanged, so that RTP
endpoints can be uniquely identified and associated with their RTP
media streams.
For proper functionality, RTCP CNAMEs should be unique within the
participants of an RTP session. However, the existing guidelines for
choosing the RTCP CNAME provided in the RTP standard (RFC 3550) are
insufficient to achieve this uniqueness. RFC 6222 was published to
update those guidelines to allow endpoints to choose unique RTCP
CNAMEs. Unfortunately, later investigations showed that some parts
of the new algorithms were unnecessarily complicated and/or
ineffective. This document addresses these concerns and replaces RFC
6222.
Download: rfc7022.txt