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ENUM

ENUM is a protocol that is the result of work of the Internet Engineering Task Force's (IETF's) Telephone Number Mapping working group. The charter of this working group was to define a Domain Name System (DNS)-based architecture and protocols for mapping a telephone number to a Uniform Resource Identifier (URI) which can be used to contact a resource associated with that number.

The protocol itself is defined in the document "E.164 number and DNS" (RFC 2916) that provides facilities to resolve E.164 telephone numbers into other resources or services on the Internet. ITU-T Recommendation E.164 is the international public telecommunication telephony numbering plan

What is ITU-T E.164? Are there related standards?

Recommendation E.164 describes the international public telecommunication numbering plan. It describes the general principles to be utilized in the assignment of international numbering resources and also the procedures and criteria for the reservation, assignment, and reclamation of E.164 country codes. The criteria and procedures are provided as a basis for the effective and efficient utilization of the available E.164 numbering resources.

What is the related DNS zone under which a parallel E.164 name space will be administered?

The Internet Architecture Board has recommended the use of the e164.arpa zone. The IAB has issued a related statement Infrastructure Domain and Sub domains. ITU Member States are currently discussing the responsibility, delegation and authority for the ENUM "root zone".

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