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Versions: 00 01 rfc3326                                  Standards Track
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        RFC 3326

        Title:      The Reason Header Field for the Session Initiation
                    Protocol (SIP)
        Author(s):  H. Schulzrinne, D. Oran, G. Camarillo
        Status:     Standards Track
        Date:       December 2002
        Mailbox:    schulzrinne@cs.columbia.edu, oran@cisco.com,
                    Gonzalo.Camarillo@ericsson.com
        Pages:      8
        Characters: 15695
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-sip-reason-01.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3326.txt


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.

This document is a product of the Session Initiation Protocol and the
Session Initiation Proposal Investigation Working Groups of the IETF.

This is now a Proposed Standard Protocol.

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.

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