[rfc-dist] RFC 6432 on Carrying Q.850 Codes in Reason Header Fields in SIP (Session Initiation Protocol) Responses

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        RFC 6432

        Title:      Carrying Q.850 Codes in Reason 
                    Header Fields in SIP (Session Initiation 
                    Protocol) Responses 
        Author:     R. Jesske, L. Liess
        Status:     Standards Track
        Stream:     IETF
        Date:       November 2011
        Mailbox:    r.jesske at telekom.de, 
                    L.Liess at telekom.de
        Pages:      4
        Characters: 7487
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-jesske-dispatch-update3326-reason-responses-05.txt

        URL:        http://www.rfc-editor.org/rfc/rfc6432.txt

Although the use of the SIP (Session Initiation Protocol) Reason
header field in responses is considered in general in RFC 3326, its
use is not specified for any particular response code.  Nonetheless,
existing deployments have been using Reason header fields to carry
failure-related Q.850 cause codes in SIP responses to INVITE requests
that have been gatewayed to Public Switched Telephone Network (PSTN)
systems.  This document normatively describes the use of the Reason
header field in carrying Q.850 cause codes in SIP responses. 
[STANDARDS-TRACK]

This is now a Proposed Standard Protocol.

STANDARDS TRACK: 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
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