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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-07.txt
Pages : 79
Date : 2007-10-29
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 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 security 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 document defines a general SDP Capability Negotiation framework.
It also specifies 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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