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Number Portability in the Global Switched Telephone Network (GSTN): An Overview (RFC3482)

IP.com Disclosure Number: IPCOM000011408D
Original Publication Date: 2003-Feb-01
Included in the Prior Art Database: 2003-Feb-19
Document File: 31 page(s) / 78K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Foster: AUTHOR [+3]

Abstract

This document provides an overview of E.164 telephone number portability (NP) in the Global Switched Telephone Network (GSTN). NP is a regulatory imperative seeking to liberalize local telephony service competition, by enabling end-users to retain telephone numbers while changing service providers. NP changes the fundamental nature of a dialed E.164 number from a hierarchical physical routing address to a virtual address, thereby requiring the transparent translation of the later to the former. In addition, there are various regulatory constraints that establish relevant parameters for NP implementation, most of which are not network technology specific. Consequently, the implementation of NP behavior consistent with applicable regulatory constraints, as well as the need for interoperation with the existing GSTN NP implementations, are relevant topics for numerous areas of IP telephony works-in-progress with the IETF.

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Network Working Group� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � M. Foster

Request for Comments: 3482� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � T. McGarry

Category: Informational� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � J. Yu

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � NeuStar, Inc.

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � February 2003

� Number Portability in the Global Switched Telephone Network (GSTN):

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � An Overview

Status of this Memo

� � This memo provides information for the Internet community.� It does

� � not specify an Internet standard of any kind.� Distribution of this

� � memo is unlimited.

Copyright Notice

� � Copyright (C) The Internet Society (2003).� All Rights Reserved.

Abstract

� � This document provides an overview of E.164 telephone number

� � portability (NP) in the Global Switched Telephone Network (GSTN).

� � NP is a regulatory imperative seeking to liberalize local telephony

� � service competition, by enabling end-users to retain telephone

� � numbers while changing service providers.� NP changes the fundamental

� � nature of a dialed E.164 number from a hierarchical physical routing

� � address to a virtual address, thereby requiring the transparent

� � translation of the later to the former.� In addition, there are

� � various regulatory constraints that establish relevant parameters for

� � NP implementation, most of which are not network technology specific.

� � Consequently, the implementation of NP behavior consistent with

� � applicable regulatory constraints, as well as the need for

� � interoperation with the existing GSTN NP implementations, are

� � relevant topics for numerous areas of IP telephony works-in-progress

� � with the IETF.

Foster, et al.� � � � � � � � � � � � � � Informational� � � � � � � � � � � � � � � � � � � � � [Page 1]

RFC 3482� � � � � Number Portability in the GSTN: An Overview� February 2003

Table of Contents

� � 1.� Introduction .................................................� 2

� � 2.� Abbreviations and Acronyms ...................................� 4

� � 3.� Types of Number Portability ..................................� 6

� � 4.� Service Provider Number Portability Schemes ..................� 7

� � � � � � 4.1� � All Call Query (ACQ) ...................................� 8

� � � � � � 4.2� � Query on Release (QoR) .................................� 9

� � � � � � 4.3� � Call Dropback .......................................... 10

� � � � � � 4.4� � Onward Routing (OR) .................................... 11

� � � � � � 4.5� � Comparisons of the Four Schemes ........................ 11

� � 5.� Database Queries in the NP Environment ....................... 13

� � � � � � 5.1� �...