Network Working Group J. Peterson Request for Comments: 3861 NeuStar Category: Standards Track August 2004 Address Resolution for Instant Messaging and Presence 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 Presence and instant messaging are defined in RFC 2778. The Common Profiles for Presence and Instant Messaging define two Universal Resource Identifier (URI) schemes: 'im' for INSTANT INBOXes and 'pres' for PRESENTITIES. This document provides guidance for locating the resources associated with URIs that employ these schemes. Table of Contents 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Address Resolution. . . . . . . . . . . . . . . . . . . . . . . 3 4. Domain Name Lookup. . . . . . . . . . . . . . . . . . . . . . . 4 5. Processing SRV RRs. . . . . . . . . . . . . . . . . . . . . . . 4 6. Processing Multiple Addresses . . . . . . . . . . . . . . . . . 5 7. Security Considerations . . . . . . . . . . . . . . . . . . . . 5 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5 9. Contributors. . . . . . . . . . . . . . . . . . . . . . . . . . 6 10. Normative References. . . . . . . . . . . . . . . . . . . . . . 6 11. Author's Address. . . . . . . . . . . . . . . . . . . . . . . . 7 12. Full Copyright Statement. . . . . . . . . . . . . . . . . . . . 8 Peterson Standards Track