Rec. ITU-T E.164 Supplement 2 (06/2020) The international public telecommunicationnumbering plan Supplement 2: Number portability
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Supplement
4 Abbreviations and acronyms
5 ITU-T E.164 number structures
     5.1 International public telecommunication number for geographic areas
     5.2 International public telecommunication number for global services
     5.3 International public telecommunication number for networks
6 Number portability types for national ITU-T E.164 numbers
7 Generic implementation of number portability
8 Entities addressed by routing
9 Number portability mechanisms
     9.1 Assumptions
     9.2 General description
          9.2.1 Call re-routed from donor network by use of onward routing principles
          9.2.2 Call re-routed by dropback principles from donor network
          9.2.3 Call re-routing initiated by "query on release" principles from donor network
          9.2.4 Routing initiated by "direct routing" or "all call query" principles
          9.2.5 Next generation network number portability issues
10 Types of addresses and numbers – within networks and across network boundaries
     10.1 Concatenated address
          10.1.1 Description of concatenated address
          10.1.2 Brief analysis
     10.2 Separated addresses
          10.2.1 Description of separated addresses
          10.2.2 Brief analysis
     10.3 RN only sent between networks
          10.3.1 Description of routing number only
          10.3.2 Brief analysis
     10.4 DN only (normally across network boundaries)
          10.4.1 Description of DN only
          10.4.2 Brief analysis
11 Combinations of addressing types, addressed entities and mechanisms: general signalling requirements
12 Examples of locations of OpDBs and CRDBs for number portability
     12.1 General description
     12.2 Examples of a number portability database solution
          12.2.1 Examples of ENUM-like technology utilization
     12.3 Use cases of number portability solutions toward all IP
13 Administrative processes
Appendix I  Use cases of number portability solutions toward all IP
     I.1 Categorization of use cases
     I.2 Use case in Japan (ENUM-like)
     I.3 Use case in the US (non-ENUM like)
     I.4 Use case in the Netherlands (both non-ENUM-like and ENUM-like could be used optionally)
     I.5 Use case in Italy (non-ENUM like)
     I.6 Use case in Switzerland (non-ENUM like)
     I.7 Use case in Sweden (non-ENUM like)
     I.8 Use case in Finland (ENUM like is foreseen)
     I.9 Use case in the UK (non-ENUM like)
     I.10 Use case in France (non-ENUM like)
     I.11 Use case in Germany (non-ENUM like)
     I.12 Use case in Spain (non-ENUM like)