Referencing Earlier Communications in SIP Requests

Document Type Expired Internet-Draft (individual)
Authors Kumiko Ono  , Henning Schulzrinne 
Last updated 2009-10-12
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document defines a SIP header extension that refers to earlier SIP or non-SIP communication in SIP requests. For example, this extension allows users to correlate a SIP session with earlier sessions or email exchanges.


Kumiko Ono (
Henning Schulzrinne (

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