Telephone Number Mapping (ENUM) Service Registration for Presence Services
RFC 3953

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Network Working Group                                        J. Peterson
Request for Comments: 3953                                       NeuStar
Category: Standards Track                                   January 2005

                Telephone Number Mapping (ENUM) Service
                  Registration for Presence Services

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 (2005).

Abstract

   This document registers a Telephone Number Mapping (ENUM) service for
   presence.  Specifically, this document focuses on provisioning pres
   URIs in ENUM.

Table of Contents

   1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 2
   2. ENUM Service Registration  . . . . . . . . . . . . . . . . . . . 2
   3. Presence for E.164 Numbers . . . . . . . . . . . . . . . . . . . 2
   4. The 'E2U+pres' Enumservice . . . . . . . . . . . . . . . . . . . 3
   5. Example of E2U+pres Enumservice  . . . . . . . . . . . . . . . . 4
   6. Security Considerations  . . . . . . . . . . . . . . . . . . . . 4
   7. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . . 5
   8. References . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
      8.1.  Normative References . . . . . . . . . . . . . . . . . . . 5
      8.2.  Informative References . . . . . . . . . . . . . . . . . . 5
   Author's Address. . . . . . . . . . . . . . . . . . . . . . . . . . 6
   Full Copyright Statement. . . . . . . . . . . . . . . . . . . . . . 7

Peterson                    Standards Track                     [Page 1]
RFC 3953        ENUM Registration for Presence Services     January 2005

1. Introduction

   ENUM (E.164 Number Mapping, RFC 3761 [1]) is a system that uses DNS
   (Domain Name Service, RFC 1034 [8]) to translate telephone numbers,
   such as +12025332600, into URIs (Uniform Resource Identifiers, RFC
   2396 [9]), such as pres:user@host.com.  ENUM exists primarily to
   facilitate the interconnection of systems that rely on telephone
   numbers with those that use URIs to identify resources.

   Presence is a service defined in RFC 2778 [2] that allows users of a
   communications service to monitor one another's availability and
   disposition in order to make decisions about communicating.  Presence
   information is highly dynamic and generally characterizes whether a
   user is online or offline, busy or idle, away from communications
   devices or nearby, and the like.

   The IETF has defined a generic URI used to identify a presence
   service for a particular resource: the 'pres' URI scheme (defined in
   CPP [4]).  This document describes an enumservice for advertising
   presence information associated with an E.164 number.

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:

      Service name: "E2U+pres"

      URI scheme(s): "pres:"

      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.

3.  Presence for E.164 Numbers

   This document specifies an enumservice field that allows presence
   information to be provided for an E.164 number.  This may include
   presence states associated with telephones, or presence of non-
   telephony communications services advertised by ENUM.

Peterson                    Standards Track                     [Page 2]
RFC 3953        ENUM Registration for Presence Services     January 2005

   Endpoints that participate in a presence architecture are known
   (following the framework in RFC 2778 [2]) as watchers and
   presentities.  Watchers subscribe to the presence of presentities and
   are notified when the presence of a presentity changes.  Watchers
   generally monitor the presence of a group of presentities with whom
   they have an ongoing association.  As an example, consider how this
   might apply to a telephony service.  Most cellular telephones today
   have an address book-like feature, a small database of names and
   telephone numbers.  Such a telephone might act as a watcher,
   subscribing to the presence of some or all of the telephone numbers
   in its address book.  The display of the telephone might then show
   its user, when a presence-enabled telephone number is selected, the
   availability of the destination.  With this information, the user
   might change their calling habits to correspond better to the