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Network Working Group C. Jennings | ||
Request for Comments: 4770 Cisco Systems | ||
Category: Standards Track J. Reschke, Ed. | ||
greenbytes | ||
January 2007 | ||
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vCard Extensions for Instant Messaging (IM) | ||
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Status of This Memo | ||
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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. | ||
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Copyright Notice | ||
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Copyright (C) The IETF Trust (2007). | ||
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Abstract | ||
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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. It | ||
allows a URI that is associated with IM or PP to be specified inside | ||
a vCard. | ||
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Table of Contents | ||
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1. Overview ........................................................2 | ||
2. IANA Considerations .............................................3 | ||
3. Formal Grammar ..................................................4 | ||
4. Example .........................................................4 | ||
5. Security Considerations .........................................4 | ||
6. Acknowledgments .................................................4 | ||
7. References ......................................................5 | ||
7.1. Normative References .......................................5 | ||
7.2. Informational References ...................................5 | ||
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Jennings & Reschke Standards Track [Page 1] | ||
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RFC 4770 IMPP vCard January 2007 | ||
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1. Overview | ||
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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. | ||
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The type entry to hold this new contact information is an IMPP type. | ||
The IMPP entry has a single URI (see RFC 3986 [3]) 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, although a | ||
parameter should occur, at most, once in a given IMPP entry. | ||
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The type of URI indicates what protocols might be usable for | ||
accessing it, but this document does not define any of the types. | ||
For example, a URI type of | ||
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o "sip" [5] indicates to use SIP/SIMPLE, | ||
o "xmpp" [6] indicates to use XMPP, | ||
o "irc" indicates to use IRC, | ||
o "ymsgr" indicates to use yahoo, | ||
o "msn" might indicate to use Microsoft messenger, | ||
o "aim" indicates to use AOL, and | ||
o "im" [7] or "pres" [8] indicates that a CPIM or CPP gateway should | ||
be used. | ||
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The normative definition of this new vCard type is given in Section | ||
2, and an informational ABNF is provided in Section 3. | ||
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Jennings & Reschke Standards Track [Page 2] | ||
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RFC 4770 IMPP vCard January 2007 | ||
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2. IANA Considerations | ||
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The required email to define this extension (as defined in RFC 2425 | ||
[1]) was sent on October 29, 2004, to the ietf-mime-direct@imc.org | ||
mailing list with the subject "Registration of text/directory MIME | ||
type IMPP" (see <http://www.imc.org/ietf-mime-direct/mail- | ||
archive/msg00068.html>). | ||
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This specification updates the "text/directory MIME Types" | ||
subregistry in the "text/directory MIME Registrations" registry at | ||
http://www.iana.org/assignments/text-directory-registrations with the | ||
following information: | ||
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Type name: IMPP | ||
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Type purpose: To specify the URI for instant messaging and presence | ||
protocol communications with the object the vCard represents. | ||
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Type encoding: 8bit | ||
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Type value: A single URI. The type of the URI indicates the protocol | ||
that can be used for this contact. | ||
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Type special notes: The type may include the type parameter "TYPE" to | ||
specify an intended use for the URI. The TYPE parameter values | ||
include one or more of the following: | ||
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o An indication of the type of communication for which this URI is | ||
appropriate. This can be a value of PERSONAL or BUSINESS. | ||
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o An indication of the location of a device associated with this | ||
URI. Values can be HOME, WORK, or MOBILE. | ||
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o The value PREF indicates this is a preferred address and has the | ||
same semantics as the PREF value in a TEL type. | ||
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Additional information can be found in RFC 4770. | ||
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Intended usage: COMMON | ||
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Jennings & Reschke Standards Track [Page 3] | ||
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RFC 4770 IMPP vCard January 2007 | ||
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3. Formal Grammar | ||
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The following ABNF grammar [4] extends the grammar found in RFC 2425 | ||
[1] (Section 5.8.2) and RFC 2426 [2] (Section 4). | ||
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;For name="IMPP" | ||
param = impp-param ; Only impp parameters are allowed | ||
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value = URI | ||
; URI defined in Section 3 of [3] | ||
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impp-param = "TYPE" "=" impp-type *("," impp-type) | ||
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impp-type = "PERSONAL" / "BUSINESS" / ; purpose of communications | ||
"HOME" / "WORK" / "MOBILE" / | ||
"PREF" / | ||
iana-token / x-name; | ||
; Values are case insensitive | ||
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4. Example | ||
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BEGIN:vCard | ||
VERSION:3.0 | ||
FN:Alice Doe | ||
IMPP;TYPE=personal,pref:im:alice@example.com | ||
END:vCard | ||
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5. Security Considerations | ||
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This does not introduce additional security issues beyond the current | ||
vCard specification. It is worth noting that many people consider | ||
their presence information more sensitive than other address | ||
information. Any system that stores or transfers vCards needs to | ||
carefully consider the privacy issues around this information. | ||
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6. Acknowledgments | ||
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Thanks to Brian Carpenter, Lars Eggert, Ted Hardie, Paul Hoffman, Sam | ||
Roberts, and Pekka Pessi for their comments. | ||
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Jennings & Reschke Standards Track [Page 4] | ||
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RFC 4770 IMPP vCard January 2007 | ||
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7. References | ||
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7.1. Normative References | ||
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[1] Howes, T., Smith, M., and F. Dawson, "A MIME Content-Type for | ||
Directory Information", RFC 2425, September 1998. | ||
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[2] Dawson, F. and T. Howes, "vCard MIME Directory Profile", RFC | ||
2426, September 1998. | ||
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[3] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform | ||
Resource Identifier (URI): Generic Syntax", STD 66, RFC 3986, | ||
January 2005. | ||
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[4] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax | ||
Specifications: ABNF", RFC 4234, October 2005. | ||
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7.2. Informational References | ||
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[5] 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. | ||
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[6] Saint-Andre, P., "Internationalized Resource Identifiers (IRIs) | ||
and Uniform Resource Identifiers (URIs) for the Extensible | ||
Messaging and Presence Protocol (XMPP)", RFC 4622, July 2006. | ||
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[7] Peterson, J., "Common Profile for Instant Messaging (CPIM)", RFC | ||
3860, August 2004. | ||
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[8] Peterson, J., "Common Profile for Presence (CPP)", RFC 3859, | ||
August 2004. | ||
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Jennings & Reschke Standards Track [Page 5] | ||
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RFC 4770 IMPP vCard January 2007 | ||
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Authors' Addresses | ||
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Cullen Jennings | ||
Cisco Systems | ||
170 West Tasman Drive | ||
MS: SJC-21/2 | ||
San Jose, CA 95134 | ||
USA | ||
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Phone: +1 408 902-3341 | ||
EMail: fluffy@cisco.com | ||
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Julian F. Reschke (editor) | ||
greenbytes GmbH | ||
Hafenweg 16 | ||
Muenster, NW 48155 | ||
Germany | ||
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Phone: +49 251 2807760 | ||
EMail: julian.reschke@greenbytes.de | ||
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Jennings & Reschke Standards Track [Page 6] | ||
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RFC 4770 IMPP vCard January 2007 | ||
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Full Copyright Statement | ||
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Copyright (C) The IETF Trust (2007). | ||
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This document is subject to the rights, licenses and restrictions | ||
contained in BCP 78, and except as set forth therein, the authors | ||
retain all their rights. | ||
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This document and the information contained herein are provided on an | ||
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS | ||
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST, | ||
AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, | ||
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT | ||
THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY | ||
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR | ||
PURPOSE. | ||
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Intellectual Property | ||
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The IETF takes no position regarding the validity or scope of any | ||
Intellectual Property Rights or other rights that might be claimed to | ||
pertain to the implementation or use of the technology described in | ||
this document or the extent to which any license under such rights | ||
might or might not be available; nor does it represent that it has | ||
made any independent effort to identify any such rights. Information | ||
on the procedures with respect to rights in RFC documents can be | ||
found in BCP 78 and BCP 79. | ||
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Copies of IPR disclosures made to the IETF Secretariat and any | ||
assurances of licenses to be made available, or the result of an | ||
attempt made to obtain a general license or permission for the use of | ||
such proprietary rights by implementers or users of this | ||
specification can be obtained from the IETF on-line IPR repository at | ||
http://www.ietf.org/ipr. | ||
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The IETF invites any interested party to bring to its attention any | ||
copyrights, patents or patent applications, or other proprietary | ||
rights that may cover technology that may be required to implement | ||
this standard. Please address the information to the IETF at | ||
ietf-ipr@ietf.org. | ||
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Acknowledgement | ||
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Funding for the RFC Editor function is currently provided by the | ||
Internet Society. | ||
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Jennings & Reschke Standards Track [Page 7] | ||
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