[AVTCORE] Fwd: I-D Action: draft-lennox-avtcore-rtp-topo-offer-answer-00.txt

Hi, all -- I've submitted this draft discussing the interaction of SDP Offer/Answer with RTP topologies -- specifically, why the RTP topology Topo-Transport-Translator can't be created with offer/answer, and why this is actually a good thing.

This is a generalization of a some issues that came up in the discussion of BUNDLE in Taipei.

Comments are welcome.

Begin forwarded message:

> From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
> Date: March 5, 2012 4:55:35 PM EST
> To: "i-d-announce@ietf.org" <i-d-announce@ietf.org>
> Subject: I-D Action: draft-lennox-avtcore-rtp-topo-offer-answer-00.txt
> Reply-To: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> 
> 	Title           : Real-Time Transport Protocol (RTP) Topology Considerations for Offer/ Answer-Initiated Sessions.
> 	Author(s)       : Jonathan Lennox
> 	Filename        : draft-lennox-avtcore-rtp-topo-offer-answer-00.txt
> 	Pages           : 11
> 	Date            : 2012-03-05
> 
>   This document discusses a number of considerations related to the
>   topologies of Real-Time Transport Protocol (RTP) sessions initated
>   using the Session Description (SDP) unicast Offer/Answer Model,
>   especially as applied to source-multiplexed sessions.
> 
>   The primary observation is that certain topologies cannot be created
>   by unicast SDP Offer/Answer.  Notably, the it is not possible to
>   negotiate the topology that RFC 5117 calls Topo-Transport-Translator
>   (or "relay").
> 
>   As a consequence of this limitation, certain topological assumptions
>   can safely be made for RTP sessions initiated using unicast SDP
>   Offer/Answer; and therefore, certain optimizations to RTP are
>   possible in such sessions.  This document also describes the
>   optimizations that these assumptions make possible.
> 
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-lennox-avtcore-rtp-topo-offer-answer-00.txt
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> This Internet-Draft can be retrieved at:
> ftp://ftp.ietf.org/internet-drafts/draft-lennox-avtcore-rtp-topo-offer-answer-00.txt
> 
> _______________________________________________
> I-D-Announce mailing list
> I-D-Announce@ietf.org
> https://www.ietf.org/mailman/listinfo/i-d-announce
> Internet-Draft directories: http://www.ietf.org/shadow.html
> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
> 

--
Jonathan Lennox
jonathan@vidyo.com