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The Session Description Protocol (SDP) was intended to describe 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
does 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.
Flemming Andreasen <firstname.lastname@example.org>
(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid)