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This draft is a work item of the Multiparty Multimedia Session Control Working Group of the IETF.
Title : SDP Capability Negotiation
Author(s) : F. Andreasen
Filename : draft-ietf-mmusic-sdp-capability-negotiation-05.txt
Pages : 63
Date : 2007-3-6
The Session Description Protocol (SDP) was intended for describing
multimedia sessions for the purposes of session announcement, session
invitation, and other forms of multimedia session initiation. SDP was
not intended to provide capability indication or capability
negotiation, however over the years, SDP has seen widespread adoption
and as a result it has been gradually extended to provide limited
support for these. SDP and its current extensions however do not have
the ability to negotiate one or more alternative transport protocols
(e.g. RTP profiles) which makes it particularly difficult to deploy
new RTP profiles such as secure RTP or RTP with RTCP-based feedback.
The purpose of this document is to address that and other real-life
limitations by extending SDP with capability negotiation parameters
and associated offer/answer procedures to use those parameters in a
backwards compatible manner.
The solution provided in this document provides a general SDP
capability negotiation framework. It also defines specifically how to
provide attributes and transport protocols as capabilities and
negotiate them using the framework. Extensions for other types of
capabilities (e.g. media types and formats) may be provided in other
documents.
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