One document matched: draft-ietf-enum-branch-location-record-00.txt
ENUM -- Telephone Number Mapping O. Lendl
Working Group enum.at
Internet-Draft August 2, 2006
Expires: February 3, 2007
The ENUM Branch Location Record
draft-ietf-enum-branch-location-record-00
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Copyright Notice
Copyright (C) The Internet Society (2006).
Abstract
This documents defines the ENUM Branch Location record (EBL) which is
used to indicate where the ENUM tree for special ENUM application is
located. The primary application for the EBL record is to provide a
temporary solution for the infrastructure ENUM tree location.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. ENUM Tree Referrals . . . . . . . . . . . . . . . . . . . . . 3
3. The EBL Resource Record . . . . . . . . . . . . . . . . . . . 4
3.1 The EBL RDATA Format . . . . . . . . . . . . . . . . . . . 4
3.2 The EBL Presentation Format . . . . . . . . . . . . . . . 4
4. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 5
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5
8.1 Normative References . . . . . . . . . . . . . . . . . . . 5
8.2 Informative References . . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . 6
Intellectual Property and Copyright Statements . . . . . . . . 7
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1. Introduction
ENUM as defined in RFC3761 [1] (User-ENUM) is not well suited for the
purpose of interconnection by carriers, as can be seen by the use of
various private tree arrangements based on ENUM mechanisms.
Using the same E.164 number to domain mapping technique for other
application under a different apex (instead of e164.arpa) is
straightforward on the technical side. Establishing the
international agreements necessary to delegate the country-code level
subdomains under the new apex is non-trivial and time-consuming.
This process is under way [5].
ENUM Branch Location records as defined by this document can be used
to quickly introduce new ENUM trees on a per-country opt-in basis by
storing the location and layout of new trees in the User-ENUM tree.
While Infrastructure ENUM is the motivation for the introduction of
the EBL record, its use it not limited to Infrastructure ENUM.
More information and motivation can be found in
draft-ietf-enum-infrastructure-enum-reqs [3] and
draft-haberler-carrier-enum [4].
2. ENUM Tree Referrals
To allow maximum flexibility, the following parameters will be used
in ENUM tree referrals.
Application
indicating to what kind of application this EBL applies to. In
the case of Infrastructure ENUM, this will be "infrastructure".
Separator
indicating what label should be inserted into the ENUM domain to
branch off to the application-specific tree. This can be an empty
(zero-length) string which means that no label will be inserted.
Position
indicating at what place this label should be inserted into the
ENUM domain to branch off to the application-specific tree. A
value of 0 means to the right of all digits.
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Apex
indicating what domain should replace "e164.arpa" as the apex for
this application.
The "application" acts as the selector and is stored as the label in
the DNS. The other three parameters make up the content of the EBL.
3. The EBL Resource Record
The EBL will reside within the country-code level in the User-ENUM
tree under e164.arpa.
The RR type code for the EBL RR is /IANA-ACTION/.
3.1 The EBL RDATA Format
The RDATA for a EBL RR consists of a position number, separator
string and an apex domain. <character-string> and <domain-name> refer
to the definitions of RFC 1035 [2].
0 1 2 3 4 5 6 7
+--+--+--+--+--+--+--+--+
| POSITION |
+--+--+--+--+--+--+--+--+
/ SEPARATOR /
+--+--+--+--+--+--+--+--+
/ APEX /
+--+--+--+--+--+--+--+--+
where POSITION is a single byte, SEPARATOR is a <character-string>
and APEX is a <domain-name>. Name-compression is not to be used for
the APEX field.
3.2 The EBL Presentation Format
The master file format follows the standard rules in RFC 1035.
POSITION is represented as decimal integer. SEPARATOR is a quoted
string, APEX is a domain name and thus does not require quoting.
4. Examples
infrastructure.3.4.e164.arpa. IN EBL 2 "i" e164.arpa.
infrastructure.1.e164.arpa. IN EBL 4 "i" example.com.
infrastructure.9.4.e164.arpa. IN EBL 0 "" ie164.arpa.
These records indicate how the transformation from E.164 number to
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ENUM domains for the application "infrastructure" should be done for
numbers in country code +43, +1, and +49. This leads to the
following mappings:
+43 15056416 6.1.4.6.5.0.5.1.i.3.4.e164.arpa
+1 5551234567 7.6.5.4.3.2.1.i.5.5.5.1.example.com
+49 891234567 7.6.5.4.3.2.1.9.8.9.4.ie164.arpa
5. Security Considerations
EBLs are used to direct the ENUM resolvers to other places in the DNS
for certain applications. As these EBLs are stored in the User-ENUM
tree, these applications therefore depend on the security of the
User-ENUM tree.
6. IANA Considerations
This documents allocates the Resource Records Type field for the EBL
record.
7. Acknowledgements
The author would like to thank Michael Haberler, Richard Stastny,
Klaus Nieminen, Richard Shockey, and Karsten Fleischhauer for their
contributions.
8. References
8.1 Normative References
[1] Faltstrom, P. and M. Mealling, "The E.164 to Uniform Resource
Identifiers (URI) Dynamic Delegation Discovery System (DDDS)
Application (ENUM)", RFC 3761, April 2004.
[2] Mockapetris, P., "Domain names - implementation and
specification", STD 13, RFC 1035, November 1987.
8.2 Informative References
[3] Lind, S. and P. Pfautz, "Infrastrucure ENUM Requirements",
draft-ietf-enum-infrastructure-enum-reqs-02 (work in progress),
April 2006.
[4] Haberler, M. and R. Stastny, "Combined User and Infrastructure
ENUM in the e164.arpa tree", draft-haberler-carrier-enum-03
(work in progress), June 2006.
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[5] Livingood, J., "The E.164 to Uniform Resource Identifiers (URI)
Dynamic Delegation Discovery System (DDDS) Application for
Infrastructure ENUM", draft-ietf-enum-infrastructure-00 (work in
progress), April 2006.
Author's Address
Otmar Lendl
enum.at GmbH
Karlsplatz 1/9
Wien A-1010
Austria
Phone: +43 1 5056416 33
Email: otmar.lendl@enum.at
URI: http://www.enum.at/
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