RFC 3761 (rfc3761) - Page 2 of 18

The E

RFC 3761                          ENUM                        April 2004


       3.1. Registration Requirements . . . . . . . . . . . . . . . .  8
            3.1.1. Functionality Requirement. . . . . . . . . . . . .  8
            3.1.2. Naming requirement . . . . . . . . . . . . . . . .  9
            3.1.3. Security requirement . . . . . . . . . . . . . . .  9
            3.1.4. Publication Requirements . . . . . . . . . . . . . 10
       3.2. Registration procedure. . . . . . . . . . . . . . . . . . 10
            3.2.1. IANA Registration. . . . . . . . . . . . . . . . . 10
            3.2.2. Registration Template. . . . . . . . . . . . . . . 11
   4.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
       4.1. Example . . . . . . . . . . . . . . . . . . . . . . . . . 11
   5.  IANA Considerations. . . . . . . . . . . . . . . . . . . . . . 12
   6.  Security Considerations. . . . . . . . . . . . . . . . . . . . 12
       6.1. DNS Security. . . . . . . . . . . . . . . . . . . . . . . 12
       6.2. Caching Security. . . . . . . . . . . . . . . . . . . . . 14
       6.3. Call Routing Security . . . . . . . . . . . . . . . . . . 14
       6.4. URI Resolution Security . . . . . . . . . . . . . . . . . 15
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 15
   8.  Changes since RFC 2916 . . . . . . . . . . . . . . . . . . . . 15
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 16
       9.1. Normative References. . . . . . . . . . . . . . . . . . . 16
       9.2. Informative References. . . . . . . . . . . . . . . . . . 16
   10. Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 17
   11. Full Copyright Statement . . . . . . . . . . . . . . . . . . . 18

1.  Introduction

   This document discusses the use of the Domain Name System (DNS) for
   storage of E.164 numbers.  More specifically, how DNS can be used for
   identifying available services connected to one E.164 number.  It
   specifically obsoletes RFC 2916 to bring it in line with the Dynamic
   Delegation Discovery System (DDDS) Application specification found in
   the document series specified in RFC 3401 [6].  It is very important
   to note that it is impossible to read and understand this document
   without reading the documents discussed in RFC 3401 [6].

   Through transformation of International Public  Telecommunication
   Numbers in the international format [5], called within this document
   E.164 numbers, into DNS names and the use of existing DNS services
   like delegation through NS records and NAPTR records, one can look up
   what services are available for a specific E.164 in a decentralized
   way with distributed management of the different levels in the lookup
   process.

   The domain "e164.arpa" is being populated in order to provide the
   infrastructure in DNS for storage of E.164 numbers.  In order to
   facilitate distributed operations, this domain is divided into
   subdomains.  Holders of E.164 numbers which want to be listed in DNS
   should contact the appropriate zone administrator according to the



Faltstrom & Mealling        Standards Track