enumservice registration for Session Initiation Protocol (SIP) Addresses-of-Record
RFC 3764

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Network Working Group                                        J. Peterson
Request for Comments: 3764                                       NeuStar
Category: Standards Track                                     April 2004

     enumservice registration for Session Initiation Protocol (SIP)
                          Addresses-of-Record

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).  All Rights Reserved.

Abstract

   This document registers an Electronic Number (ENUM) service for the
   Session Initiation Protocol (SIP), pursuant to the guidelines in RFC
   3761.  Specifically, this document focuses on provisioning SIP
   addresses-of-record in ENUM.

Table of Contents

   1.  Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . 2
   2.  ENUM Service Registration . . . . . . . . . . . . . . . . . . . 2
   3.  Addresses-of-record in SIP. . . . . . . . . . . . . . . . . . . 3
   4.  The 'E2U+SIP' enumservice . . . . . . . . . . . . . . . . . . . 5
   5.  Example of E2U+SIP enumservice. . . . . . . . . . . . . . . . . 5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
   8.  References. . . . . . . . . . . . . . . . . . . . . . . . . . . 6
       8.1.  Normative References. . . . . . . . . . . . . . . . . . . 6
       8.2.  Informative References. . . . . . . . . . . . . . . . . . 7
   9.  Acknowledgements. . . . . . . . . . . . . . . . . . . . . . . . 7
   10. Author's Address. . . . . . . . . . . . . . . . . . . . . . . . 7
   11. Full Copyright Statement. . . . . . . . . . . . . . . . . . . . 8

Peterson                    Standards Track                     [Page 1]
RFC 3764                    SIP enumservice                   April 2004

1.  Introduction

   ENUM (E.164 Number Mapping, RFC 2916 [6]) is a system that uses DNS
   (Domain Name Service, STD 13, RFC 1034 [3]) to translate telephone
   numbers, like '+12025332600', into URIs (Uniform Resource
   Identifiers, RFC 2396 [4]), like 'sip:egar@example.com'.  ENUM exists
   primarily to facilitate the interconnection of systems that rely on
   telephone numbers with those that use URIs to route transactions.
   This document applies to the revised version of ENUM described in RFC
   3761.

   SIP (Session Initiation Protocol, RFC 3261 [2]) is a text-based
   application protocol that allows endpoints on the Internet to
   discover one another in order to exchange context information about a
   session they would like to share.  Common forms of communication that
   are set up by SIP include Internet telephony, instant messaging,
   video, Internet gaming and other forms of real-time communications.
   SIP is a multi-service protocol capable of initiating sessions
   involving different forms of real-time communications simultaneously.
   SIP is a protocol that finds the best way for parties to communicate.

2.  ENUM Service Registration

   As defined in [1], the following is a template covering information
   needed for the registration of the enumservice specified in this
   document.

      Enumservice Name: "E2U+SIP"

      Type(s): "SIP"

      Subtype(s): N/A

      URI Scheme(s): "sip:", "sips:"

      Functional Specification: see Section 4

      Security considerations: see Section 6

      Intended usage: COMMON

      Author: Jon Peterson (jon.peterson@neustar.biz)

      Any other information that the author deems interesting: See
      Section 3

Peterson                    Standards Track                     [Page 2]
RFC 3764                    SIP enumservice                   April 2004

3.  Addresses-of-record in SIP

   This document specifies an enumservice field that is appropriate for
   SIP addresses-of-record URIs.  Various other types of URIs can be
   present in SIP requests.  A URI that is associated with a particular
   SIP user agent (for example, a SIP phone) is commonly known as a SIP
   contact address.

   The difference between a contact address and an address-of-record is
   like the difference between a device and its user.  While there is no
   formal distinction in the syntax of these two forms of addresses,
   contact addresses are associated with a particular device, and may
   have a very device-specific form (like sip:10.0.0.1, or
   sip:edgar@ua21.example.com).  An address-of-record, however,
   represents an identity of the user, generally a long-term identity,
   and it does not have a dependency on any device; users can move
   between devices or even be associated with multiple devices at one