IPTEL WG C. Jennings
Internet-Draft Cisco Systems
Expires: June 9, 2006 V. Gurbani
Lucent Technologies, Inc./Bell
Laboratories
Dec 06, 2005
The Internet Assigned Number Authority (IANA) tel Uniform Resource
Identifier (URI) Parameter Registry
draft-ietf-iptel-tel-reg-00
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Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
This document creates an Internet Assigned Number Authority (IANA)
registry for the tel Uniform Resource Identifier (URI) parameters,
and their values. It also lists the already existing parameters to
be used as initial values for that registry.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Use of the Registry . . . . . . . . . . . . . . . . . . . . . 3
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
4.1 tel URI Parameters Registry . . . . . . . . . . . . . . . 4
4.2 Registration Policy for tel URI Parameters . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 5
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.1 Normative References . . . . . . . . . . . . . . . . . . . 5
7.2 Informative References . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 6
Intellectual Property and Copyright Statements . . . . . . . . 7
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1. Introduction
RFC 3966 [1] allows new tel URI parameters, and new parameter values
to be defined. However, RFC 3966 omitted an IANA registry for them.
This specification creates such a registry.
2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [2].
3. Use of the Registry
The tel URI parameters and values for these parameters MUST be
documented in a standards-track RFC in order to be registered by
IANA. This documentation MUST fully explain the syntax, intended
usage, and semantics of the parameter. The intent of this
requirement is to assure interoperability between independent
implementations, and to prevent accidental namespace collisions
between implementations of dissimilar features.
RFCs defining tel URI parameters, or parameter values MUST register
them with IANA as described below.
Registered tel URI parameters and their values are to be considered
"reserved words". In order to preserve interoperability, registered
parameters MUST be used in a manner consistent with that described in
their defining RFC. Implementations MUST NOT utilize "private" or
"locally defined" URI parameters that conflict with registered
parameters.
Some tel URI parameters only accept a set of predefined parameter
values while others can take any value. There are also parameters
that can not have any value. Registering all parameter values for
all tel URI parameters of this type would require a large number of
sub-registries. Instead, we have chosen to register URI parameter
values by reference. That is, the entry in the URI parameter
registry for a given URI parameter contains references to the RFCs
defining new values of that parameter.
The tel URI parameter registry contains a column that indicates
whether or not each parameter only accepts a set of predefined
values. The column can contain Yes, No, or NA. Implementers of
parameters with a "yes" in that column need to find all the valid
parameter values in the RFCs provided as references. Parameters that
are not allowed to have a parameters have a value of "NA".
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4. IANA Considerations
The specification creates a new IANA registry named "tel URI
Parameters".
4.1 tel URI Parameters Registry
New tel URI parameters and new parameter values are registered by the
IANA. When registering a new tel parameter or a new value for a
parameter, the following information MUST be provided.
o Name of the parameter.
o Whether the parameter only accepts a set of predefined values. If
the parameter does not allow any value, this field is marked as
"NA".
o Reference to the RFC defining the parameter and to any RFC that
defines new values for the parameter.
Table 1 contains the initial values for this registry.
Parameter Name Predefined Values Reference
-------------- ----------------- ---------
isub Yes [RFC 3966]
ext Yes [RFC 3966]
enumdi NA [RFC AAAA]
npdi NA [RFC BBBB]
rn Yes [RFC BBBB]
rn-context Yes [RFC BBBB]
cic Yes [RFC BBBB]
cic-context Yes [RFC BBBB]
tgrp Yes [RFC CCCC]
trunk-context Yes [RFC CCCC]
Table 1: IANA tel URI parameter registry
Note to RFC Editor: Please replace AAAA with the RFC number for [6].
Please replace BBBB with the RFC number for [5]. Please replace CCCC
with the RFC number for [4].
4.2 Registration Policy for tel URI Parameters
As per the terminology in RFC 2434 [3], the registration policy for
tel URI parameters shall be "Specification Required".
For the purposes of this registry, the parameter for which IANA
registration is requested MUST be defined by a standards-track RFC.
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5. Security Considerations
The registry in this document does not in itself have security
considerations. However, as mentioned in RFC 3427, an important
reason for the IETF to manage the extensions of SIP is to ensure that
all extensions and parameters are able to provide secure usage. The
supporting RFC publications for parameter registrations described
this specification MUST provide detailed security considerations for
them.
6. Acknowledgments
The bulk of this document comes from RFC 3969 [7] written by Gonzalo
Camarillo.
7. References
7.1 Normative References
[1] Schulzrinne, H., "The tel URI for Telephone Numbers", RFC 3966,
December 2004.
[2] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[3] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA
Considerations Section in RFCs", BCP 26, RFC 2434, October 1998.
[4] Jennings, C. and V. Gurbani, "Representing trunk groups in tel/
sip Uniform Resource Identifiers (URIs)",
draft-ietf-iptel-trunk-group-06 (work in progress),
December 2005.
[5] Yu, J., "New Parameters for the "tel" URI to Support Number
Portability", draft-ietf-iptel-tel-np-07 (work in progress),
July 2005.
[6] Stastny, R., "The ENUM Dip Indicator parameter for the "tel"
URI", draft-ietf-iptel-tel-enumdi-01 (work in progress),
April 2005.
7.2 Informative References
[7] Camarillo, G., "The Internet Assigned Number Authority (IANA)
Uniform Resource Identifier (URI) Parameter Registry for the
Session Initiation Protocol (SIP)", BCP 99, RFC 3969,
December 2004.
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Authors' Addresses
Cullen Jennings
Cisco Systems
170 West Tasman Drive
Mailstop SJC-21/2
San Jose, CA 95134
USA
Phone: +1 408 902-3341
Email: fluffy@cisco.com
Vijay K. Gurbani
Lucent Technologies, Inc./Bell Laboratories
2000 Lucent Lane
Room 6G-440
Naperville, IL 60532
USA
Phone: +1 630 224-0216
Email: vkg@lucent.com
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