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Telephone Number Mapping A. Brown
Internet Draft Nortel Networks
Document: <draft-ietf-enum-rqmts-00.txt> November 1999
Category: Informational
ENUM Requirements
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026 [1].
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts. Internet-Drafts are draft documents valid for a maximum of
six months and may be updated, replaced, or obsoleted by other
documents at any time. It is inappropriate to use Internet- Drafts
as reference material or to cite them other than as "work in
The list of current Internet-Drafts can be accessed at
The list of Internet-Draft Shadow Directories can be accessed at
1. Abstract
This paper defines the requirements for a DNS-based architecture and
protocols for mapping a telephone number to a set of attributes
(e.g., URLs) which can be used to contact a resource associated with
that number. There are many possible protocols that can be
considered for a telephone number mapping service. The purpose of
this document is to focus discussion on a DNS-based solution. The
intention is to enumerate the expectations of such a solution and to
clarify the scope.
2. Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
this document are to be interpreted as described in RFC-2119 [2].
3. Requirements
3.1 Endpoint Address Lookup
The system SHALL provide a service for the retrieval of endpoint
addresses (e.g., email address, IP address, SIP address, etc. )in
the form or URLs. The system SHALL also be capable of retrieving the
addresses of servers, if available, which may contain this endpoint
ENUM Requirements November 1999
3.2 Capabilities Retrieval/Negotiation
The retrieval or negotiation of capabilities is beyond the scope of
the system.
3.3 Retrieval of Additional Information
The retrieval of additional, application-specific information (e.g.,
spoken name for verification purposes) is beyond the scope of the
system. The system MUST provide a service for the retrieval of
protocol and service information if available.
3.4 Qualification of the Request
The system is not required to enable the qualification of a request
by a user, for the purposes of filtering for reducing returned
information or for traffic reduction.
3.5 Provisioning
The scope of the architecture and protocol does not include
provisioning. As well, propagation of changes to information
accessible via the system is not expected to be instantaneous.
3.6 Response Timeout
The system SHALL have a defined timeout mechanism.
3.7 Global Number Portability
The system MUST support existing local number portability
mechanisms, where applicable. It is RECOMMENDED that the system not
be designed in such as way as to impede future global number
3.8 Scalability
The system MUST scale to handle quantities of telephone numbers and
queries comparable to current and expected future PSTN usage.
3.9 Query Performance
The system is not expected to respond to queries with the same
performance levels as current PSTN queries.
3.10 Other PSTN Services
Other PSTN type services such as Emergency 911, directory assistance
411, and other carrier codes and services accessible via phone
signaling is outside the scope of ENUM.
ENUM Requirements November 1999
3.11 Privacy
The system MUST allow the owner of the telephone number to control
the information which prospective callers may receive.
3.12 Competition
The system MUST provide the capability for more than one
organization to provide information on the same telephone number.
3.13 Authorization of Requests and Responses
The system SHALL enable the authorization of requests and responses.
3.14 Privacy and Integrity of Requests and Responses
The system SHALL enable the privacy and integrity of requests and
3.15 Call Routing
The system is not required to provide a service for routing calls or
locating gateways to a specific service.
3.16 Service Logic
The system is not responsible for employing service logic for the
intelligent retrieval of information.
3.17 E.164 Numbers
The system is not responsible for returning information on private
numbering plans and non-E.164 numbers. The system is responsible
for returning information on 1-800 and other legitimate E.164
4. Security Considerations
This document specifies several security requirements including
privacy of information, and authorization, privacy and integrity or
requests and responses.
The system will be designed to retrieve information required to
initiate an Internet telephony session. Each of these session types
will have their own security threats, which should be addressed in
the groups responsible for those services.
5. References
1 Bradner, S., "The Internet Standards Process -- Revision 3", BCP
9, RFC 2026, October 1996.
ENUM Requirements November 1999
2 Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997
6. Acknowledgements
This document is based on discussions from the ENUM working group.
7. Author's Addresses
Anne Brown
Nortel Networks
1050 Morrison Drive
Nepean, Ontario
K2H 8K7
Phone: +1 613 765 5274
Full Copyright Statement
"Copyright (C) The Internet Society (date). All Rights Reserved.
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or assist in its implmentation may be prepared, copied, published
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are included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
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