Carrier/Infrastructure ENUM Requirements draft-lind-infrastructure-enum-reqs-01.

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Carrier/Infrastructure ENUM Requirements draft-lind-infrastructure-enum-reqs-01

Definition - Infrastructure ENUM The use of the technology in RFC3761 by the carrier-of- record for a specific E.164 number to map a telephone number into a URI that identifies a specific point of interconnection to that service provider's network that could enable the originating party to establish communication with the associated terminating party

Definition – Carrier-of-Record typically a service provider authorized to issue E.164 numbers for the provisioning of PSTN service under the authority of a National Regulatory Authority (NRA), but generally exhibits one or more of the following properties: o it has been assigned one or more national number ranges by an NRA. o it has been assigned a number range directly by the ITU, for instance a code under "International Networks" (+882) or "Universal Personal Telecommunications (UPT)" (+878). o it can be the recipient of a number porting operation. o it provides a PSTN point-of-interconnect for the number. It is understood that definition of carrier or record is ultimately a matter for national authorities to determine. Carrier-of-Record is the registrant in infrastructure ENUM

Requirements (1) 2.1. Infrastructure ENUM SHALL provide a means for a carrier to populate DNS RRs in a common publicly accessible namespace for the E.164 numbering resources for which it is the carrier-of-record Queries of infrastructure ENUM FQDNs MUST return a result, even if the result is NXDOMAIN. Queries must not be rejected, e.g. based on ACLs Infrastructure ENUM SHALL support RRs providing a URI that can identify a point of interconnection for delivery of communications addressed to the E.164 number. 2.4.Infrastructure ENUM SHALL support an IRIS capability that allows qualified parties to obtain information regarding the E.164 numbering resources and the corresponding carrier-of-record. 2.5.Implementation of Infrastructure ENUM MUST NOT restrict the ability of an end-user, in a competitive environment, to choose a Registrar and/or Tier 2 name server provider for end-user ENUM registrations.

Requirements (2) 2.6. Infrastructure ENUM SHALL be implemented under a TLD that can support reliability and performance suitable for PSTN applications Infrastructure ENUM MUST meet all reasonable privacy concerns about visibility of information an end user has no control over, for example discovery of unlisted numbers, or inadvertent disclosure of user identity. 2.8.Proposed implementations of Infrastructure ENUM SHOULD a. Minimize changes required to existing requirements that are part of RFC 3761 b. Work with open numbering plans c. Restrict additional functionality to carrier resolvers. d. Minimize the number of lookups required to obtain as many NAPTR records (end-user and carrier) as possible. e. Minimize the client knowledge of the numbering plan required. f. Maximize synergies with end-user ENUM g. Support interworking with private ENUM trees.