Media State under Preconditions in the Session Initiation Protocol (SIP)

Document Type Expired Internet-Draft (individual)
Authors Gonzalo Camarillo  , Jouni Maenpaa  , Gao yang 
Last updated 2010-03-08
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


In this document, we describe how a UAS (User Agent Server) involved in a session modification can explicitly signal the point where the new session parameters start being used. Explicitly signalling such a change in the session parameters can be useful so that network intermediaries such as B2BUAs (Back-to-back User Agents) have a clear picture of the session's state at every point.


Gonzalo Camarillo (
Jouni Maenpaa (
Gao yang (

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