Mapping the Extensible Messaging and Presence Protocol (XMPP) to Common Presence and Instant Messaging (CPIM)
RFC 3922

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Network Working Group                                     P. Saint-Andre
Request for Comments: 3922                    Jabber Software Foundation
Category: Standards Track                                   October 2004

    Mapping the Extensible Messaging and Presence Protocol (XMPP) to
              Common Presence and Instant Messaging (CPIM)

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2004).

Abstract

   This memo describes a mapping between the Extensible Messaging and
   Presence Protocol (XMPP) and the Common Presence and Instant
   Messaging (CPIM) specifications.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Approach . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Address Mapping  . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  Syntax Mapping of Instant Messages . . . . . . . . . . . . . .  5
   5.  Syntax Mapping of Presence Information . . . . . . . . . . . . 13
   6.  XMPP-CPIM Gateway as Presence Service  . . . . . . . . . . . . 26
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 31
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 32
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 33
   Full Copyright Statement . . . . . . . . . . . . . . . . . . . . . 34

Saint-Andre                 Standards Track                     [Page 1]
RFC 3922                      XMPP to CPIM                  October 2004

1.  Introduction

1.1.  Overview

   The Instant Messaging and Presence (IMPP) Working Group has defined
   an abstract framework for interoperability among instant messaging
   (IM) and presence systems that are compliant with [IMP-REQS].  This
   framework is commonly called Common Presence and Instant Messaging or
   "CPIM".  The CPIM family of specifications include a Common Profile
   for Instant Messaging [CPIM] (also called CPIM), a Common Profile for
   Presence [CPP], a CPIM Message Format [MSGFMT], and a Common Presence
   Information Data Format [PIDF].  (Note: To prevent confusion, Common
   Presence and Instant Messaging is referred to herein collectively as
   "the CPIM specifications", whereas the Common Profile for Instant
   Messaging is referred to as "CPIM".)

   This memo describes how the Extensible Messaging and Presence
   Protocol ([XMPP-CORE], [XMPP-IM]) maps to the abstract model
   contained in the CPIM specifications, mainly for the purpose of
   establishing gateways between XMPP services and non-XMPP services
   that conform to [IMP-REQS].  Such a gateway, referred to herein as an
   "XMPP-CPIM gateway", may be established to interpret the protocols of
   one service and translate them into the protocols of the other
   service.  We can visualize this relationship as follows:

     +-------------+        +-------------+        +------------+
     |             |        |             |        |            |
     |    XMPP     |        |  XMPP-CPIM  |        |  Non-XMPP  |
     |   Service   | <----> |   Gateway   | <----> |  Service   |
     |             |        |             |        |            |
     +-------------+        +-------------+        +------------+

   This memo defines a mapping for use by a gateway that translates
   between XMPP and a non-XMPP protocol via the CPIM specifications.
   Such a gateway is not an intermediate hop on a network of non-XMPP
   servers (whose native formats may or may not be defined by the CPIM
   specifications), but a dedicated translator between XMPP and a
   non-XMPP protocol, where the CPIM specifications define the common
   formats into which the protocols are translated for purposes of
   interworking.

   The mapping defined herein applies to instant messages and presence
   information that are not encrypted or signed for end-to-end security.
   For information about secure communications to or from an XMPP
   service through an XMPP-CPIM gateway, refer to [XMPP-E2E].

Saint-Andre                 Standards Track                     [Page 2]
RFC 3922                      XMPP to CPIM                  October 2004

1.2.  Terminology

   This memo inherits vocabulary defined in [IMP-MODEL].  Terms such as
   CLOSED, INSTANT INBOX, INSTANT MESSAGE, OPEN , PRESENCE SERVICE,
   PRESENTITY, SUBSCRIPTION, and WATCHER are used in the same meaning as
   defined therein.

   This memo also inherits vocabulary defined in [XMPP-CORE].  Terms
   such as ENTITY, NODE IDENTIFIER, DOMAIN IDENTIFIER, RESOURCE
   IDENTIFIER, MESSAGE STANZA, and PRESENCE STANZA are used in the same
   meaning as defined therein.