Interworking between the Session Initiation Protocol (SIP) and the Extensible Messaging and Presence Protocol (XMPP): One-to-One Text Chat Sessions
RFC 7573

Document Type RFC - Proposed Standard (June 2015; No errata)
Last updated 2015-10-14
Replaces draft-saintandre-sip-xmpp-chat
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Stream WG state Submitted to IESG for Publication
Document shepherd Yana Stamcheva
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IESG IESG state RFC 7573 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Alissa Cooper
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IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                    P. Saint-Andre
Request for Comments: 7573                                          &yet
Category: Standards Track                                      S. Loreto
ISSN: 2070-1721                                                 Ericsson
                                                               June 2015

   Interworking between the Session Initiation Protocol (SIP) and the
           Extensible Messaging and Presence Protocol (XMPP):
                     One-to-One Text Chat Sessions

Abstract

   This document defines a bidirectional protocol mapping for the
   exchange of instant messages in the context of a one-to-one chat
   session between a user of the Session Initiation Protocol (SIP) and a
   user of the Extensible Messaging and Presence Protocol (XMPP).
   Specifically for SIP text chat, this document specifies a mapping to
   the Message Session Relay Protocol (MSRP).

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 5741.

   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/rfc7573.

Copyright Notice

   Copyright (c) 2015 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
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   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

Saint-Andre & Loreto         Standards Track                    [Page 1]
RFC 7573               SIP-XMPP Interworking: Chat             June 2015

Table of Contents

   1. Introduction ....................................................2
   2. Intended Audience ...............................................3
   3. Terminology .....................................................4
   4. XMPP to MSRP ....................................................4
   5. MSRP to XMPP ....................................................9
   6. Composing Events ...............................................13
      6.1. Use of the Gone Chat State ................................14
   7. Delivery Reports ...............................................15
   8. Message Size ...................................................17
   9. Internationalization Considerations ............................18
   10. Security Considerations .......................................18
   11. References ....................................................18
      11.1. Normative References .....................................18
      11.2. Informative References ...................................19
   Acknowledgements ..................................................20
   Authors' Addresses ................................................20

1.  Introduction

   Both the Session Initiation Protocol (SIP) [RFC3261] and the
   Extensible Messaging and Presence Protocol (XMPP) [RFC6120] can be
   used for the purpose of one-to-one text chat over the Internet.  To
   ensure interworking between these technologies, it is important to
   define bidirectional protocol mappings.

   The architectural assumptions underlying such protocol mappings are
   provided in [RFC7247], including mapping of addresses and error
   conditions.  This document specifies mappings for one-to-one text
   chat sessions (sometimes called "session-mode" messaging); in
   particular, this document specifies mappings between XMPP messages of
   type "chat" and the Message Session Relay Protocol (MSRP) [RFC4975],
   which is commonly used in SIP-based systems for chat functionality
   (although note that MSRP is not conjoined to SIP, and can be used by
   non-SIP technologies).  Mappings for single instant messages and
   groupchat are provided in [RFC7572] and [GROUPCHAT].

   The approach taken here is to directly map syntax and semantics from
   one protocol to another.  The mapping described herein depends on the
   protocols defined in the following specifications:

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