Technical Summary
NTP format timestamps are used by several RTP protocols for
synchronisation and statistical measurements. This memo specifies SDP
signalling identifying timestamp reference clock sources and SDP
signalling identifying the media clock sources in a multimedia session.
Working Group Summary
This document was written as a result of discussion on another draft
which made it clear that there is a need to be able to specify the clock
used for RTP in order to achieve better synchronization between sources.
It was seen as a general problem and this document represent the WG
consensus.
Document Quality
The authors are aware of two implementation that use at least some of
the signaling capabilities described in this draft: http://
soundandpicture.com/2013/11/axia-announces-first-broadcast-product-with-
aes67-compliance/ and http://ravenna.alcnetworx.com/technology/open-
technology-standards/aes67-x192.html
The draft is a normative reference for the recently published AES67
standard and is referenced by
https://ietf.org/doc/draft-ietf-avtcore-idms/ which is now in the RFC
editor queue waiting for this document.
There was an SDP directorate review and comments were addressed.
Personnel
Document Shepherd is Roni Even and the responsible AD is Alissa Cooper.