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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-06.txt
Pages : 77
Date : 2007-7-10
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, notably in the form of the offer/answer model defined in RFC 3264. SDP and its current extensions however do not
define how to negotiate one or more alternative transport protocols
(e.g. RTP profiles) or attributes. This makes it difficult to deploy
new RTP profiles such as secure RTP or RTP with RTCP-based feedback,
negotiate use of different keying mechanisms, etc. It also presents
problems for some forms of media negotiation.
The purpose of this document is to address these shortcomings 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 media formats) may be provided in
other documents.
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