Update to Private Header Field P-Visited-Network-ID in Session Initiation Protocol (SIP) Requests and Responses
draft-jesske-update-p-visited-network-01

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Last updated 2019-03-11
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dispatch                                                       R. Jesske
Internet-Draft                                          Deutsche Telekom
Updates: RFC7976 (if approved)                            March 11, 2019
Intended status: Informational
Expires: September 12, 2019

     Update to Private Header Field P-Visited-Network-ID in Session
            Initiation Protocol (SIP) Requests and Responses
              draft-jesske-update-p-visited-network-01.txt

Abstract

   The Third Generation Partnership Project (3GPP) has identified cases
   where the private header field P-Visited-Network-ID SIP private
   header extensions, which is defined in RFC 7315 and updated by RFC
   7976, needs to be included in SIP requests and responses.  This
   document updates RFC 7976, in order to allow inclusion of the P-
   Visited-Network-ID header field in responses.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on September 12, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Applicability of P-Visited-Network-ID in responses  . . . . .   2
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   3
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   The Third Generation Partnership Project (3GPP) has identified cases
   where different Session Initiation Protocol (SIP) [RFC3261] private
   header extensions referred to as "P-" header fields, and defined in
   [RFC7315], need to be included in SIP requests and responses which is
   currently not allowed according to [RFC7315].  This document updates
   [RFC7315], to allow the inclusion of the affected "P-" header fields
   in such requests and responses.  This document also makes updates for
   [RFC7976] to fix misalignments that occurred when [RFC7315] was
   updated for specific "P-" header fields which are mainly used in (and
   in most cases, only defined for) networks defined by the 3GPP.  The
   updates defined in this document will not cause backward-
   compatibility problems in 3GPP networks which are using
   [TS.3GPP.24.229].

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  Applicability of P-Visited-Network-ID in responses

   In [RFC7976] section 3.  "Updates to RFC 7315" the P-Visited-Network-
   ID header field was restricted to the following: The P-Visited-
   Network-ID header field can appear in all SIP methods except ACK,
   BYE, CANCEL, NOTIFY, PRACK, INFO, and UPDATE.  This document allows
   the use of the P-Visited-Network-ID header field additionally within
   Responses as follows: Any SIP Response message, except for a 100
   (Trying), MAY contain a P-Visited-Network-ID header field.  The P-

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   Visited-Network-ID header field is not needed in the 100 (Trying)
   responses, since they are transmitted hop by hop, not end to end.
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