vCard Extensions for Instant Messaging (IM)

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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.¶

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, although a parameter should occur at most once in a given IMPP entry.¶

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¶

"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. IANA Considerations

The required email to define this extension (as defined in RFC2425) 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".¶

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:¶

Type name: IMPP¶

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

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.

Additional information can be found in RFCAAAA.¶

Intended usage: COMMON¶

[Note to IANA: Please replace AAAA with the RFC number for this specification.]¶

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

6. Security Considerations

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.¶

8. References

8.1. 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.

8.2. 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”, Internet-Draft 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”, Internet-Draft draft-saintandre-xmpp-uri-08 (work in progress), December 2004.
[8]: Peterson, J., “Common Profile for Presence (CPP)”, RFC 3859, August 2004.
[9]: Peterson, J., “Common Profile for Instant Messaging (CPIM)”, RFC 3860, August 2004.

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