Private SIP Extension for Original Dialog Identifier

Document Type Expired Internet-Draft (individual)
Last updated 2002-05-22
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This memo describes a private extension to SIP in the form of a P-Original-Dialog-ID header. The header is used to correlate two different dialogs across a B2BUA that is non-transparent to dialogs. The contents of the header identify the original dialog (Call-id, From tag, To tag) associated with the SIP entity that inserted the header into a request. When the same instance of the header is received at that SIP entity in a different request, then it is used to correlate the two different dialogs.


Eric Henrikson (

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