Internet Assigned Numbers Authority (IANA) Registration of Instant Messaging and Presence DNS SRV RRs for the Session Initiation Protocol (SIP)
RFC 5509
Document | Type |
RFC - Proposed Standard
(April 2009; No errata)
Was draft-loreto-simple-im-srv-label (individual in rai area)
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Author | Salvatore Loreto | ||
Last updated | 2015-10-14 | ||
Stream | Internet Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5509 (Proposed Standard) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Jon Peterson | ||
Send notices to | (None) |
Network Working Group S. Loreto Request for Comments: 5509 Ericsson Category: Standards Track April 2009 Internet Assigned Numbers Authority (IANA) Registration of Instant Messaging and Presence DNS SRV RRs for the Session Initiation Protocol (SIP) 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) 2009 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents in effect on the date of publication of this document (http://trustee.ietf.org/license-info). Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Abstract This document registers with IANA two new DNS SRV protocol labels for resolving Instant Messaging and Presence services with SIP. Loreto Standards Track [Page 1] RFC 5509 IANA SRV Label for SIP April 2009 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. DNS SRV Usage of SIP with 'im' and 'pres' URIs . . . . . . . . 3 4. Security Considerations . . . . . . . . . . . . . . . . . . . . 4 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4 5.1. Instant Messaging SRV Protocol Label Registration . . . . . 5 5.2. Presence SRV Protocol Label Registration . . . . . . . . . 5 6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 5 7. Normative References . . . . . . . . . . . . . . . . . . . . . 6 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 6 Loreto Standards Track [Page 2] RFC 5509 IANA SRV Label for SIP April 2009 1. Introduction The Service Record (SRV) [RFC2782] identifies the host(s) that will support particular services. The DNS is queried for SRV RR in the general form: _Service._Proto.Name Service: the symbolic name of the desired service Proto: the protocol of the desired service Name: the domain name for which this record is valid "Address Resolution for Instant Messaging and Presence" [RFC3861] provides guidance for locating the services associated with URIs that employ the following two URI schemes [RFC3986]: 'im' for INSTANT INBOXes [RFC3860] and 'pres' for PRESENTITIES [RFC3859]. In order to ensure that the association between "_im" and "_pres" and their respective underlying services are deterministic, the IANA has created two independent registries: the Instant Messaging SRV Protocol Label registry and the Presence SRV Protocol Label registry. This document defines and registers the "_sip" protocol label in both registries so that computer programs can resolve 'im:' and 'pres:' URIs down to SIP addresses. Moreover, this document explains how the use of SIP for Presence and Instant Messaging uses SRV. 2. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 3. DNS SRV Usage of SIP with 'im' and 'pres' URIs Although there are standard procedures for resolving 'im' and 'pres' URIs (Section 3 of [RFC3861]), the labels for SIP are not registered. Section 5 of [RFC3428] states that if a user agent (UA) is presented with an IM URI (e.g., "im:fred@example.com") as the address for an instant message, it SHOULD resolve it to a SIP URI, and place the resulting URI in the Request-URI of the MESSAGE request before Loreto Standards Track [Page 3] RFC 5509 IANA SRV Label for SIP April 2009 sending. Following the procedures defined in [RFC3861], in order to resolve the IM URI, the UA performs a SRV lookup for: _im._sip.example.com Assuming that the example.com domain offers a SIP service for instant messaging at simple.example.com, this will result in a resolution of _im._sip.example.com. to simple.example.com. Thus, the instant messaging URI im:fred@example.com would resolve to a SIP URI of sip:fred@simple.example.com.Show full document text