End-to-End Session Identification in IP-Based Multimedia Communication Networks
RFC 7989

Document Type RFC - Proposed Standard (October 2016; No errata)
Obsoletes RFC 7329
Last updated 2018-12-20
Replaces draft-jones-insipid-session-id
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Christer Holmberg
Shepherd write-up Show (last changed 2016-05-10)
IESG IESG state RFC 7989 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Ben Campbell
Send notices to (None)
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                          P. Jones
Request for Comments: 7989                                  G. Salgueiro
Obsoletes: 7329                                                C. Pearce
Category: Standards Track                                      P. Giralt
ISSN: 2070-1721                                      Cisco Systems, Inc.
                                                            October 2016

                  End-to-End Session Identification in
               IP-Based Multimedia Communication Networks

Abstract

   This document describes an end-to-end session identifier for use in
   IP-based multimedia communication systems that enables endpoints,
   intermediary devices, and management systems to identify a session
   end-to-end, associate multiple endpoints with a given multipoint
   conference, track communication sessions when they are redirected,
   and associate one or more media flows with a given communication
   session.  While the identifier is intended to work across multiple
   protocols, this document describes its usage in the Session
   Initiation Protocol (SIP).

   This document also describes a backwards-compatibility mechanism for
   an existing session identifier implementation (RFC 7329) that is
   sufficiently different from the procedures defined in this document.

   This document obsoletes RFC 7329.

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
   http://www.rfc-editor.org/info/rfc7989.

Jones, et al.                Standards Track                    [Page 1]
RFC 7989                  End-To-End Session ID             October 2016

Copyright Notice

   Copyright (c) 2016 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
   (http://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.

Jones, et al.                Standards Track                    [Page 2]
RFC 7989                  End-To-End Session ID             October 2016

Table of Contents

   1. Introduction ....................................................4
   2. Conventions Used in This Document ...............................5
   3. Session Identifier Definitions, Requirements, and Use Cases .....5
   4. Constructing and Conveying the Session Identifier ...............5
      4.1. Constructing the Session Identifier ........................5
      4.2. Conveying the Session Identifier ...........................6
   5. The Session-ID Header Field .....................................8
   6. Endpoint Behavior ...............................................9
   7. Processing by Intermediaries ...................................11
   8. Handling of Remote UUID Changes ................................14
   9. Associating Endpoints in a Multipoint Conference ...............16
   10. Examples of Various Call Flow Operations ......................17
      10.1. Basic Call with Two UUIDs ................................18
      10.2. Basic Call Transfer Using REFER ..........................22
      10.3. Basic Call Transfer Using Re-INVITE ......................24
      10.4. Single Focus Conferencing ................................26
      10.5. Single Focus Conferencing Using a Web-Based
            Conference Service .......................................28
      10.6. Cascading Conference Bridges .............................30
           10.6.1. Establishing a Cascaded Conference ................30
           10.6.2. Calling Into Cascaded Conference Bridges ..........31
      10.7. Basic 3PCC for Two UAs ...................................33
      10.8. Handling in 100 Trying SIP Response and CANCEL Request ...33
           10.8.1. Handling in a 100 Trying SIP Response .............34
           10.8.2. Handling a CANCEL SIP Request .....................35
      10.9. Out-of-Dialog REFER Transaction ..........................36
   11. Compatibility with a Previous Implementation ..................37
   12. Security and Privacy Considerations ...........................39
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