Session Initiation Protocol (SIP) Offer/Answer with Multipart Alternative

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Last updated 2006-03-07
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SIP needs a mechanism for general backwards compatibility for moving from SDP to SDPng or moving from non end-to-end encrypted SDP to end- to-end encrypted SDP. This document specifies how a SIP offer uses multipart/alternative, and how an answer indicates which part was selected.


Dan Wing (
Cullen Jennings (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)