RFC 3326 (rfc3326) - Page 1 of 8

The Reason Header Field for the Session Initiation Protocol (SIP)

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Network Working Group                                     H. Schulzrinne
Request for Comments: 3326                           Columbia University
Category: Standards Track                                        D. Oran
                                                                   Cisco
                                                            G. Camarillo
                                                                Ericsson
                                                           December 2002


   The Reason Header Field for the Session Initiation Protocol (SIP)

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

Abstract

   For creating services, it is often useful to know why a Session
   Initiation Protocol (SIP) request was issued.  This document defines
   a header field, Reason, that provides this information.  The Reason
   header field is also intended to be used to encapsulate a final
   status code in a provisional response.  This functionality is needed
   to resolve the "Heterogeneous Error Response Forking Problem", or
   HERFP.



















Schulzrinne, et. al.        Standards Track
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