Content-ID Header Field in the Session Initiation Protocol (SIP)
RFC 8262

Document Type RFC - Proposed Standard (October 2017; No errata)
Last updated 2017-10-25
Replaces draft-holmberg-sipcore-content-id
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication (wg milestone: May 2017 - Request publication ... )
Document shepherd Jean Mahoney
Shepherd write-up Show (last changed 2017-05-10)
IESG IESG state RFC 8262 (Proposed Standard)
Consensus Boilerplate Yes
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Responsible AD Ben Campbell
Send notices to Jean Mahoney <mahoney@nostrum.com>
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                       C. Holmberg
Request for Comments: 8262                                   I. Sedlacek
Updates: 5368, 5621, 6442                                       Ericsson
Category: Standards Track                                   October 2017
ISSN: 2070-1721

    Content-ID Header Field in the Session Initiation Protocol (SIP)

Abstract

   This document specifies the Content-ID header field for usage in the
   Session Initiation Protocol (SIP).  This document also updates RFC
   5621, which only allows a Content-ID URL to reference a body part
   that is part of a multipart message-body.  This update enables a
   Content-ID URL to reference a complete message-body and metadata
   provided by some additional SIP header fields.

   This document updates RFC 5368 and RFC 6442 by clarifying their usage
   of the SIP Content-ID header field.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in 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/rfc8262.

Holmberg & Sedlacek          Standards Track                    [Page 1]
RFC 8262                    Content-ID in SIP               October 2017

Copyright Notice

   Copyright (c) 2017 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.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Identifying a Body Part . . . . . . . . . . . . . . . . .   3
     1.2.  Referencing a Body Part . . . . . . . . . . . . . . . . .   3
     1.3.  Problem Statement . . . . . . . . . . . . . . . . . . . .   4
     1.4.  Consequences  . . . . . . . . . . . . . . . . . . . . . .   4
       1.4.1.  Example 1: SIP INVITE . . . . . . . . . . . . . . . .   4
       1.4.2.  Example 2: SIP REFER  . . . . . . . . . . . . . . . .   6
     1.5.  Solution  . . . . . . . . . . . . . . . . . . . . . . . .   7
     1.6.  Backward Compatibility  . . . . . . . . . . . . . . . . .   7
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   7
   3.  Content-ID Header Field . . . . . . . . . . . . . . . . . . .   8
     3.1.  Introduction  . . . . . . . . . . . . . . . . . . . . . .   8
     3.2.  Syntax  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     3.3.  Semantics . . . . . . . . . . . . . . . . . . . . . . . .   8
     3.4.  Procedures  . . . . . . . . . . . . . . . . . . . . . . .   9
       3.4.1.  User Agent (UA) Procedures  . . . . . . . . . . . . .   9
       3.4.2.  Proxy Procedures  . . . . . . . . . . . . . . . . . .   9
       3.4.3.  Example: Referencing the Message-Body of a SIP
               Message . . . . . . . . . . . . . . . . . . . . . . .   9
   4.  Update to RFC 5368  . . . . . . . . . . . . . . . . . . . . .  10
   5.  Update to RFC 5621  . . . . . . . . . . . . . . . . . . . . .  11
   6.  Update to RFC 6442  . . . . . . . . . . . . . . . . . . . . .  11
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     8.1.  Header Field  . . . . . . . . . . . . . . . . . . . . . .  12
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

Holmberg & Sedlacek          Standards Track                    [Page 2]
RFC 8262                    Content-ID in SIP               October 2017

1.  Introduction

1.1.  Identifying a Body Part

   A SIP message consists of a start-line, one or more header fields, an
   empty line indicating the end of the header fields, and an optional
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