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Number Portability Parameters for the "tel" URI
RFC 4694

Document type: RFC - Proposed Standard (October 2006)
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 4694 (Proposed Standard)
Responsible AD: Cullen Jennings
Send notices to: jdrosen@cisco.com, fluffy@cisco.com

Network Working Group                                              J. Yu
Request for Comments: 4694                                       NeuStar
Category: Standards Track                                   October 2006

            Number Portability Parameters for the "tel" URI

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document defines five parameters in the "tel" Uniform Resource
   Identifier (URI) to carry the number portability (NP)-related
   information.  Those parameters can be passed to the next-hop network
   node after an NP database dip has been performed.

Table of Contents

   1. Introduction ....................................................2
   2. Conventions .....................................................3
   3. Abbreviations ...................................................3
   4. Formal Syntax ...................................................3
   5. Normative Rules .................................................5
      5.1. Handling "tel" URI with NP Parameter or Parameters .........6
      5.2. Adding NP Parameter or Parameters to the "tel" URI .........8
           5.2.1. Retrieving NP-related Information for a
                  Geographical Telephone Number .......................8
           5.2.2. Retrieving NP-related Information for a
                  Freephone Number ....................................9
           5.2.3. Adding Location Information about the Caller .......10
           5.2.4. Adding NP Parameter or Parameters Due to
                  Protocol Conversion ................................10
   6. Examples .......................................................11
   7. Security Considerations ........................................13
   8. Acknowledgements ...............................................13
   9. IANA Considerations ............................................13

Yu                          Standards Track                     [Page 1]
RFC 4694            NP Parameters for the "tel" URI         October 2006

   10. References ....................................................14
      10.1. Normative References .....................................14
      10.2. Informative References ...................................14

1.  Introduction

   Number portability (NP) [RFC3482] allows telephony subscribers to
   keep their telephone numbers when they change service provider
   (service provider portability), move to a new location (location
   portability), or change the subscribed services (service
   portability).  The telephone numbers can be the geographical
   telephone numbers, mobile telephone numbers, freephone numbers, or
   other types of non-geographical telephone numbers.  Some mobile
   telephone numbers are like geographical telephone numbers (e.g.,
   those in North America) and others are of non-geographical nature but
   their routing is similar to the routing of geographical telephone
   numbers so they are not specifically mentioned in this document.  The
   freephone numbers are also known as toll-free phone numbers.  The
   called party who is assigned the freephone number pays the call
   charge when the caller dials the freephone number.

   NP impacts call signaling and routing.  One impact is the need to
   carry the NP-related information in the "tel" Uniform Resource
   Identifier (URI) [RFC3966] for protocols such as the Session
   Initiation Protocol (SIP) [RFC3261] and H.323 [H323] after the NP
   database dip has been performed.  Another impact is for a Voice over
   IP (VoIP) server to use the NP-related information in a received
   "tel" URI to determine routing.

   A routing number is associated with a geographical or mobile
   telephone number that has been ported out from a donor carrier to
   another carrier.  A donor carrier is the initial carrier where a
   geographical telephone number was allocated before ever being ported.
   A "non-ported" geographical or mobile telephone number does not have
   any routing number associated with it because the first N digits of
   the geographical or mobile telephone number can be used for routing.
   A routing number can also be used to indicate the switch or network
   node that originates a call or service similar to the Jurisdiction
   Information Parameter in Signaling System Number 7 (SS7) Integrated

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