draft-ietf-enum-e164-gstn-np-05.txt

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                                                            Mark Foster 
Internet Draft                                              Tom McGarry 
Document: <draft-ietf-enum-e164-gstn-np-05.txt>                James Yu 
                                                          NeuStar, Inc. 
Category: Informational                                   June 24, 2002 
 
 
              Number Portability in the GSTN: An Overview 
 
 
Status of this Memo 
 
   This document is an Internet-Draft and is in full conformance with 
   all provisions of Section 10 of RFC2026 [RFC].  
 
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   Copyright Notice 
 
      Copyright (C) The Internet Society (2002).  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 work-in-progress at IETF. 
  
Foster,McGarry,Yu         Expired on December 23, 2002        [Page 1] 

Number Portability in the GSTN: An Overview               June 24, 2002 

    
   Table of Contents 
    
    1.  Introduction ...............................................  2 
    2.  Abbreviations and Acronyms .................................  4 
    3.  Types of Number Portability ................................  5 
    4.  Service Provider Number Portability Schemes ................  7 
       4.1   All Call Query (ACQ) ..................................  7 
       4.2   Query on Release (QoR) ................................  8 
       4.3   Call Dropback .........................................  9 
       4.4   Onward Routing (OR) ...................................  9 
       4.5   Comparisons of the Four Schemes ....................... 10 
    5.  Database Queries in the NP Environment ..................... 11 
       5.1   U.S. and Canada ....................................... 12 
       5.2   Europe ................................................ 13 
    6.  Call Routing in the NP Environment ......................... 14 
       6.1   U.S. and Canada ....................................... 14 
       6.2   Europe ................................................ 15 
    7.  NP Implementations for Geographic E.164 Numbers ............ 17 
    8.  Number Conservation Method Enabled By NP ................... 20 
       8.1   Block Pooling ......................................... 20 
       8.2   ITN Pooling ........................................... 21 
    9.  Potential Implications ..................................... 21 
   10.  Security Considerations .................................... 24 
   11.  IANA Considerations ........................................ 24 
   12.  Normative References ....................................... 24 
   13.  Informative References ..................................... 25 
   14.  Acknowledgement ............................................ 25 
   15.  Authors