A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Economical Use of the Offer/Answer Model in Sessions
with Multiple Media Sources
Author(s) : Emil Ivov
Filename : draft-ivov-mmusic-multiple-sources-00.txt
Pages : 15
Date : 2013-07-15
Abstract:
The Session Description Protocol (SDP) Offer/Answer model describes a
mechanism that allows two entities to negotiate a multimedia session.
The SDP syntax of the Offer/Answer model uses constructs known as
media (m=) lines to describe each medium. In SDP itself these "m="
lines were designed to describe RTP sessions with any number of
streams (SSRCs). Yet, Offer/Answer implementations in SIP
applications have most often used them as an envelope for a maximum
of two RTP streams (SSRCs) at a time: one in each direction. The
most common reason for this has been the fact these applications
could not meaningfully render multiple SSRCs simultaneously.
The above situation has led to difficulties once the need to
represent multiple (SSRCs) in an interoperable manner became more
common.
This document explores the use of "m=" lines for the negotiation of
sessions with multiple media sources, as per their original design in
SDP. It presents the advantages of such an approach as well as the
challenges that it implies in terms of interoperability with already
deployed legacy devices.
The model described here was first presented in the RTCWEB No Plan
proposal. The reason to spin it off into this new document is mainly
to separate the parts related to Offer/Answer and "m=" line
semantics, from those that are specific to WebRTC.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ivov-mmusic-multiple-sources
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ivov-mmusic-multiple-sources-00
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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