I'd like to call attention to

http://www.ietf.org/internet-drafts/draft-ietf-mmusic-offer-answer-examples-01.txt

----------------------------------------------------------------------
Abstract

   This document gives examples of Session Description Protocol (SDP)
   offer answer exchanges.  Examples include codec negotiation and
   selection, hold and resume, and addition and deletion of media
   streams.  The examples show multiple media types, bidirectional,
   unidirectional, inactive streams and dynamic payload types. Common
   Third Party Call Control (3pcc) examples are also given.

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If you haven't already seen it, please look through it and let us know
if there are any other scenarios that you think need to be detailed.

The MMUSIC working group believes this draft is close to done
and will soon move toward issuing it as an RFC. 

Thanks,
RjS

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