This document is obsolete. Please
refer to RFC 6350.
Network Working Group C. Jennings Request for Comments: 4770 Cisco Systems Category: Standards Track J. Reschke, Ed. greenbytes January 2007
vCard Extensions for Instant Messaging (IM)
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 (C) The IETF Trust (2007).
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.
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  and RFC 2426  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 (see RFC 3986 ) 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
o "sip"  indicates to use SIP/SIMPLE, o "xmpp"  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"  or "pres"  indicates that a CPIM or CPP gateway should be used.
The normative definition of this new vCard type is given in Section 2, and an informational ABNF is provided in Section 3.
The required email to define this extension (as defined in RFC 2425 ) was sent on October 29, 2004, to the email@example.com mailing list with the subject "Registration of text/directory MIME type IMPP" (see <http://www.imc.org/ietf-mime-direct/mail- archive/msg00068.html>).
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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