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2.8.21 Telephone Number Mapping (enum)

NOTE: This charter is a snapshot of the 55th IETF Meeting in Altanta, Georgia USA. It may now be out-of-date.

Last Modifield: 05/06/2002

Patrik Faltstrom <>
Richard Shockey <>
Transport Area Director(s):
Scott Bradner <>
A. Mankin <>
Transport Area Advisor:
Scott Bradner <>
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Description of Working Group:
This working group has defined a DNS-based architecture and protocol [RFC 2916] by which an E.164 number, as defined in ITU Recommendation E.164, can be expressed as a Fully Qualified Domain Name in a specific Internet Infrastructure domain defined for this purpose ( The result of the ENUM query is a series of DNS NAPTR resource records [RFC2915] which can be used to contact a resource (e.g.URI) associated with that number.

The Working Group proposes to advance RFC 2916 from Proposed Standard to Draft Standard.


E.164 numbers are globally unique, language independent identifiers for resources on Public Telecommunication Networks that can support many different services and protocols. E.164 numbers are used to identify ordinary phones, fax machines, pagers, data modems, email clients, text terminals for the hearing impaired, etc.

A prospective caller may wish to discover which services and protocols are supported by the terminal named by a given telephone number. The caller may also require more information than just the telephone number to communicate with the terminal.

The holder of an E.164 number or device may wish to control what URI's, are associated with that number.

Working Group Revised Goals and Scope:

1. The working group will update RFC 2916 to reference the DDDS system (revision of RFC 2915) and advance RFC 2916 to Draft Standard.

2. The working group will examine and document various aspects of ENUM administrative and/or operational procedures as Informational. Issues to be considered include privacy and security considerations in storing ENUM related data as well as validation and authentication of data, including DDDS NAPTR records in the DNS. The working group will coordinate activities in these areas with the DNSEXT WG and PROVREG WG when appropriate.

3. The Working Group will continue to maintain appropriate contact and liaison with standards bodies and groups, specifically ITU-T SG2, in order to provide technical or educational information as needed, such as the appropriate use of DNS. The Working Group will encourage the exchange of technical information within the emerging global ENUM community as well as documentation on practical experiences with implementations or administration of RFC 2916.

Goals and Milestones:
Done  Initial draft of Service ENUM Requirements
Done  Initial draft of ENUM Protocol
Done  Revised draft of ENUM Protocol
Done  Submit ENUM Protocol document to IESG for publication as Proposed
JUN 02  Revise and update RFC 2916 appropriate to DDDS (revision of 2915) and advance to Draft Standard
JUL 02  Document appropriate ENUM Registration and Provisioning Procedures (Informational)
AUG 02  Document appropriate ENUM Operational Security, Privacy Issues and Procedures (Informational)
  • - draft-ietf-enum-e164-gstn-np-05.txt
  • - draft-ietf-enum-rfc2916bis-01.txt
  • - draft-ietf-enum-epp-e164-00.txt
  • - draft-ietf-enum-usage-scenarios-00.txt
  • Request For Comments:
    RFC2916 PS E.164 number and DNS

    Current Meeting Report

    None received.


    IFAX Service of ENUM
    'enumservice' Compendium, Trial, Demo
    SIP and ENUM
    ENUM Privacy and Security issues