The Reason Header Field for the Session Initiation Protocol

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Last updated 2002-03-04
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


For creating services, it is often useful to know why a SIP request was issued. This document defines an optional informational header field, Reason, that provides this information.


Henning Schulzrinne (
DaveO (
Gonzalo Camarillo (

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