Subject: I-D Action: draft-lennox-avtcore-rtp-topo-offer-answer-00.txt

From: [email-masked]
Date: Mon, 05 Mar 2012 13:55:35 -0800

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.

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