ISUP Cause Location Parameter for the SIP Reason Header Field
draft-ietf-sipcore-reason-q850-loc-01

Document Type Active Internet-Draft (sipcore WG)
Last updated 2017-09-29
Replaces draft-sipcore-reason-q850-loc
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Sipcore                                                        R. Jesske
Internet-Draft                                          Deutsche Telekom
Updates: RFC6442 (if approved)                        September 29, 2017
Intended status: Standards Track
Expires: April 2, 2018

     ISUP Cause Location Parameter for the SIP Reason Header Field
                 draft-ietf-sipcore-reason-q850-loc-01

Abstract

   The SIP Reason header field is defined for carrying ISUP cause values
   as well as SIP response codes.  Some services in SIP networks may
   need to know the ISUP location where the call was released in the
   PSTN network to correctly interpret the reason of release.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 2, 2018.

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Jesske                    Expires April 2, 2018                 [Page 1]
Internet-Draft       ISUP Release Location Parameter      September 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Rationale . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   4.  Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Example . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   4
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
     8.1.  Registration of isup-cause-location Parameter for reason
           header field  . . . . . . . . . . . . . . . . . . . . . .   5
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   5
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   5
     10.2.  Informative References . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The SIP Reason header field specification [RFC3326] describes a SIP
   header field that is used to indicate that a SIP request is carrying
   the reason of release.  It may be an SIP response or ISUP release
   cause as specified within [Q.850].  [RFC3326] does specify that a
   ISUP [Q.850] cause code can be carried within a SIP response.  The
   [Q.850] location information identifies the part of the ISUP network
   where the call was released.

   This document adds a location value parameter to the reason-extension
   parameter in [RFC3326] so that the [Q.850] location value can be
   interworked from the PSTN.  The interworking from PTSN needs only to
   include the location received by the interworking gateway.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  Rationale

   The primary intent of the parameter defined in this specification is
   for use in IMS networks defined by 3GPP but also open to be used by
   any other network.  The purpose of this parameter is to transport the
   location of call release from the originating PSTN entity to the SIP
   entity receiving the response or BYE message containing the location
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