Early Media in SIP: Problem Statement, Requirements, and Analysis of Solutions
draft-barnes-sip-em-ps-req-sol-00

Document Type Expired Internet-Draft (individual)
Last updated 2007-02-08
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at
https://www.ietf.org/archive/id/draft-barnes-sip-em-ps-req-sol-00.txt

Abstract

The Session Initiation Protocol (SIP) enables and permits endpoints in an INVITE transaction to send media packets before an SDP offer/ answer exchange has completed; we refer to such media packets as early media. The use of early media is common in current SIP implementations, and causes several problems, which have been documented elsewhere. This document puts forward the goal of modifying SIP so that compliant implementations will complete an SDP exchange before sending media, and lays out high-level requirements for such a solution. The set of possible solutions is then laid out, and each possibility examined in light of these requirements.

Authors

Russ Barnes (rbarnes@clark.net)
Matt Lepinski (mlepinsk@bbn.com)

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