P-Charge-Info: A Private Header Field (P-Header) Extension to the Session Initiation Protocol (SIP)
RFC 8496

Document Type RFC - Informational (October 2018; No errata)
Was draft-york-p-charge-info (individual in art area)
Last updated 2018-10-31
Replaces draft-york-dispatch-p-charge-info
Stream IETF
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Document shepherd Jean Mahoney
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IESG IESG state RFC 8496 (Informational)
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Responsible AD Ben Campbell
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Internet Engineering Task Force (IETF)                           D. York
Request for Comments: 8496                                    Individual
Category: Informational                                       T. Asveren
ISSN: 2070-1721                                    Ribbon Communications
                                                            October 2018

   P-Charge-Info: A Private Header Field (P-Header) Extension to the
                   Session Initiation Protocol (SIP)

Abstract

   This text documents the current usage of P-Charge-Info, an existing
   Session Initiation Protocol (SIP) private header field (P-Header)
   used to convey billing information about the party to be charged.
   This P-Header is currently used in production by several equipment
   vendors and carriers and has been in use since at least 2007.  This
   document details the registration of this header field with IANA.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are candidates for any level of Internet
   Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8496.

York & Asveren                Informational                     [Page 1]
RFC 8496                      P-Charge-Info                 October 2018

Copyright Notice

   Copyright (c) 2018 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   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.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   4
   3.  Purpose of This Document  . . . . . . . . . . . . . . . . . .   4
   4.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  The P-Charge-Info Header  . . . . . . . . . . . . . . . . . .   5
     5.1.  Applicability Statement for the P-Charge-Info Header
           Field . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     5.2.  Usage of the P-Charge-Info Header Field . . . . . . . . .   5
       5.2.1.  Procedures at the UA  . . . . . . . . . . . . . . . .   5
       5.2.2.  Procedures at the Proxy . . . . . . . . . . . . . . .   6
     5.3.  Use-Case Example  . . . . . . . . . . . . . . . . . . . .   6
   6.  Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  Header Field  . . . . . . . . . . . . . . . . . . . . . .   7
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
     8.1.  Trust Relationship  . . . . . . . . . . . . . . . . . . .   7
     8.2.  Untrusted Peers . . . . . . . . . . . . . . . . . . . . .   8
       8.2.1.  Ingress from Untrusted Peers  . . . . . . . . . . . .   8
       8.2.2.  Egress to Untrusted Peers . . . . . . . . . . . . . .   8
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Appendix A.  Alternatives . . . . . . . . . . . . . . . . . . . .  10
     A.1.  P-Charging-Vector . . . . . . . . . . . . . . . . . . . .  10
     A.2.  P-DCS-Billing-Info  . . . . . . . . . . . . . . . . . . .  10
     A.3.  P-Asserted-Identity . . . . . . . . . . . . . . . . . . .  11
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

York & Asveren                Informational                     [Page 2]
RFC 8496                      P-Charge-Info                 October 2018

1.  Overview

   In certain network configurations, several network entities have
   found it useful to decouple the identity of the caller (what is
   normally thought of as "Caller ID") from the identity/number used for
   billing purposes.  This document records the current usage of
   P-Charge-Info, a private SIP header field, to provide simple billing
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