Infrastructure ENUM Requirements
RFC 5067

 
Document Type RFC - Informational (November 2007; No errata)
Last updated 2013-03-02
Replaces draft-lind-infrastructure-enum-reqs
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IESG IESG state RFC 5067 (Informational)
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Responsible AD Jon Peterson
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Network Working Group                                            S. Lind
Request for Comments: 5067                                     AT&T Labs
Category: Informational                                        P. Pfautz
                                                                    AT&T
                                                           November 2007

                    Infrastructure ENUM Requirements

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Abstract

   This document provides requirements for "infrastructure" or "carrier"
   ENUM (E.164 Number Mapping), defined as the use of RFC 3761
   technology to facilitate interconnection of networks for E.164 number
   addressed services, in particular but not restricted to VoIP (Voice
   over IP.)

Table of Contents

   1.  Infrastructure ENUM . . . . . . . . . . . . . . . . . . . . . . 1
     1.1.  Definition  . . . . . . . . . . . . . . . . . . . . . . . . 1
     1.2.  Background  . . . . . . . . . . . . . . . . . . . . . . . . 2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  Requirements for Infrastructure ENUM  . . . . . . . . . . . . . 3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   6.  Normative References  . . . . . . . . . . . . . . . . . . . . . 5

1.  Infrastructure ENUM

1.1.  Definition

   Infrastructure ENUM is defined as the use of the technology in RFC
   3761 [1] by the carrier-of-record (as defined below) for a specific
   E.164 number [2] to publish the mapping of the E.164 number into a
   URI [3] that identifies a specific point of interconnection to that
   service provider's network.  It is separate from any URIs that the
   end user, who registers their E.164 number, may wish to associate
   with that E.164 number.

Lind & Pfautz                Informational                      [Page 1]
RFC 5067            Infrastructure ENUM Requirements       November 2007

   "Infrastructure ENUM" is distinguished from "End User ENUM", defined
   in RFC3761 [1], in which the entity or person having the right to use
   a number has the sole discretion about the content of the associated
   domain and thus the zone content.  From a domain registration
   perspective, the end user number assignee is thus the registrant.
   Within the infrastructure ENUM namespace, we use the term "carrier-
   of-record" for the entity having discretion over the domain and zone
   content and acting as the registrant.  The "carrier-of-record" is:

   o The Service Provider to which the E.164 number was allocated for
   end user assignment, whether by the National Regulatory Authority
   (NRA) or the International Telecommunication Union (ITU), for
   instance, a code under "International Networks" (+882) or "Universal
   Personal Telecommunications (UPT)" (+878) or,

   o if the number is ported, the service provider to which the number
   was ported, or

   o where numbers are assigned directly to end users, the service
   provider that the end user number assignee has chosen to provide a
   Public Switched Telephone Network/Public Land Mobile Network (PSTN/
   PLMN) point-of-interconnect for the number.

   It is understood that the definition of carrier-of-record within a
   given jurisdiction is subject to modification by national
   authorities.

1.2.  Background

   Voice service providers use E.164 numbers currently as their main
   naming and routing vehicle.  Infrastructure ENUM in e164.arpa or
   another publicly available tree allows service providers to link
   Internet-based resources such as URIs to E.164 numbers.  This allows
   service providers, in addition to interconnecting via the PSTN/PLMN
   (or exclusively), to peer via IP-based protocols.  Service providers
   may announce all E.164 numbers or number ranges they host, regardless
   of whether the final end user device is on the Internet, on IP-based
   open or closed Next Generation Networks (NGNs), or on the PSTN or
   PLMN, provided that an access point of some type to the destination
   service provider's network is available on the Internet.  There is
   also no guarantee that the originating service provider querying
   infrastructure ENUM is able to access the ingress network element of
   the destination provider's network.  Additional peering and
   accounting agreements requiring authentication may be necessary.  The
   access provided may also be to a shared network of a group of
   providers, resolving the final destination network within the shared
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