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Versions: 00 01 02 03 04 05 06 07 08 RFC 4770

IMPP                                                         C. Jennings
Internet-Draft                                             Cisco Systems
Expires: April 22, 2005                                 October 22, 2004



                        vCard Extensions for IM
                      draft-jennings-impp-vcard-04


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Copyright Notice


   Copyright (C) The Internet Society (2004).  All Rights Reserved.


Abstract


   This document describes an extension to vCard to support Instant
   Messaging (IM) and Presence Protocol (PP) applications.  IM and PP
   are becoming increasingly common ways of communicating, and users
   want to save this contact information in their address books.  This
   draft allows a URI that is associated with IM or PP to be specified
   inside of a vCard.


1.  Conventions


   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",




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   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [3].


2.  Overview


   As more and more people use various instant messaging (IM) and
   presence protocol (PP) applications, it becomes important for them to
   be able to share this contact address information along with the rest
   of their contact information.  RFC 2425 [1] and RFC 2426 [2] define a
   standard format for this information which is referred to as vCard.
   This document defines a new type in a vCard for representing instant
   IM and PP URIs.  It is very similar to existing types for
   representing email address and telephone contact information.


   The type entry to hold this new contact information is an IMPP type.
   The IMPP entry has a single URI that indicates the address of a
   service that provides IM, PP, or both.  Also defined are some
   parameters that give hints as to when certain URIs would be
   appropriate.  A given vCard can have multiple IMPP entries but each
   entry can contain only one URI.  Each IMPP entry can contain multiple
   parameters.  Any combination of parameters is valid, though a
   parameter should occur at most once in a given IMPP entry.


   The type of URI indicates what protocols might be useable for
   accessing it, but this document does not define any of the types.
   For example a URI type of


      "sip"[6] indicates to use SIP/SIMPLE,
      "xmpp"[7] indicates to use XMPP,
      "irc"[5]  indicates to use IRC,
      "ymsgr" indicates to use yahoo,
      "msn" might indicate to use Microsoft messenger,
      "aim" indicates to use AOL, and
      "im"[9] or "pres"[8] indicates to use a CPIM or CPP gateway.


   The normative definition of this new vCard type is given in Section
   3, and an informational ABNF is provided in Section 4.


3.  IMPP Type Definition


   To: ietf-mime-direct@imc.org


   Subject: Registration of text/directory MIME type IMPP


   Type name: IMPP


   Type purpose: To specify the URI for instant messaging and presence
   protocol communication with the object the vCard represents.




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   Type encoding: 8bit


   Type value: A single URI.  The type of the URI indicates the protocol
   that can be used for this contact.


   Type special notes: The type can include the type parameter "TYPE" to
   specify an intended use for the URI.  The TYPE parameter values can
   include:


      An indication of the type of communication for which this URI is
      appropriate.  This can be a value of PERSONAL or BUSINESS.


      An indication of the location of a device associated with this
      URI.  Values can be HOME, WORK, or MOBILE.


      The value PREF indicates this is a preferred address and has the
      same semantics as the PREF value in a TEL type.


   Intended usage: COMMON


4.  Formal Grammar


   The following ABNF grammar[4] extends the grammar found in RFC 2425
   [1] and RFC 2426 [2].



   ;For name="IMPP"
    param      = impp-param ; Only impp parameters are allowed


    value      = uri


    impp-param = "TYPE" "=" impp-type *("," impp-type)


    impp-type  = "PERSONAL" / "BUSINESS" / ; purpose of communications
                 "HOME" / "WORK" / "MOBILE" /
                 "PREF" /
                 iana-token / x-name;
                 ; Values are case insensitive



5.  Example



   BEGIN:vCard
   VERSION:3.0
   FN:Alice Doe
   IMPP;TYPE=personal,pref:im:alice@example.com
   END:vCard




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6.  IANA Considerations


   Section 3 forms the IANA registration.


7.  Security Considerations


   This does not introduce additional security issues beyond current
   vCard specification.  It is worth noting that many people consider
   their presence information more sensitive than some other address
   information.  Any system that stores or transfers vCards needs to
   carefully consider the privacy issues around this information.


8.  Acknowledgments


   Thanks to Paul Hoffman, Sam Roberts and Pekka Pessi for comments.


9.  References


9.1  Normative References


   [1]  Howes, T., Smith, M. and F. Dawson, "A MIME -- --Content-Type
        for Directory Information", RFC 2425, September 1998.


   [2]  Dawson, F. and T. Howes, "vCard MIME Directory Profile", RFC
        2426, September 1998.


   [3]  Bradner, S., "Key words for use in RFCs to Indicate Requirement
        Levels", BCP 14, RFC 2119, March 1997.


9.2  Informational References


   [4]  Crocker, D. and P. Overell, "Augmented BNF for Syntax
        Specifications: ABNF", RFC 2234, November 1997.


   [5]  Butcher, S., "Uniform Resource Locator Schemes for Internet
        Relay Chat Entities", draft-butcher-irc-url-04 (work in
        progress), January 2004.


   [6]  Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A.,
        Peterson, J., Sparks, R., Handley, M. and E. Schooler, "SIP:
        Session Initiation Protocol", RFC 3261, June 2002.


   [7]  Saint-Andre, P., "XMPP URI Format", draft-saintandre-xmpp-uri-06
        (work in progress), October 2004.


   [8]  Peterson, J., "Common Profile for Presence (CPP)", RFC 3859,
        August 2004.





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   [9]  Peterson, J., "Common Profile for Instant Messaging (CPIM)", RFC
        3860, August 2004.



Author's Address


   Cullen Jennings
   Cisco Systems
   170 West Tasman Drive
   MS: SJC-21/2
   San Jose, CA  95134
   USA


   Phone: +1 408 902-3341
   EMail: fluffy@cisco.com





































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   Internet Society.




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