Numbering, Naming, and
Addressing at ITU-T Study Group
2 (SG2)
Presentation by:
Fred Gaechter
Rapporteur, Q1/2
+1 732 699 5500
fredgaechter@monmouth.com
Document IPW-3
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Question 1: Applications of Numbering,
Naming and Addressing Plans for Fixed &
Mobile Services
ITU-T Study Group 2: Network & Service Operations
 Collaborators
 Work Method & Considerations
 Scope of Work
 NN&A Expertise & Experience
 Successful Resolutions
 E.164 Numbers - Format and Functions
 NN&A for New Technologies
 Work Program for 2001-2005 Study Period
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Q1/2 Collaborators
 Network Operators (Competitors)
Domestic - fixed and wireless
International
Global and Regional Satellite
 Service Providers
 Vendors - Equipment and Software
 Regulatory Authorities
 Numbering Plan Administrators
 Industry Associations
 Regional Standards Forums
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Work Methods and Considerations
 Work Methods
 Contribution driven
 Consensus decisions at RG and WP levels
 Work Considerations
 Enable new services and capabilities
 Ensure resource inventory - availability vs. conservation
 Fair and equitable use and assignment of resources
 Accommodate and encourage competition
 Conform to regulations in all countries
 Support growth in developing countries
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Scope of Work
 Development, Maintenance, and Application of E-Series
Numbering, Naming and Addressing Recommendations
 E.164
– E.164.1 - Criteria & Procedures for the Reservation, Assignment &
Reclamation of E.164 CCs and ICs
 E.168 - Application of E.164 for UPT
 E.169 - Application of E.164 Numbering Plan for UIFN
– E.169.2 - Application of E.164 Numbering Plan for UIPRN
– E.169.3 - Application of E.164 Numbering Plan for UISCN
 E.190
 E.191 - B-ISDN Numbering and Addressing
– E.191.1 - Criteria & Procedures for ITU-Defined AESAs
 E.193 - E.164 Country Code Expansion
 E.195 - ITU Global Numbering Resource Administration
 E.212 - International Identification Plan for Mobile Terminals and Mobile
Users
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Scope of Work
 Resolve requests for Numbering Resources
 Develop New Recommendations
 Consultant to the ITU-TSB (Resource Registrar)
Numbering Coordination Team (NCT)
 Assignment Guidelines and Procedures for Global
Resources
 Global Numbering Resource Management
 Lead ITU Study Group(SG2) for Numbering matters
(Res. 20)
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Successful Issue Resolutions
 Expanded Numbering Resource Functionalities
 E.164 - Geographic to Services, Networks, and GMSSs
 E.212 - Wireless to Fixed
 Numbering Resources for New Services/Capabilities
 UPT, B-ISDN, UIFS, UIPRS, UISCS, GMSS, IMT2000
 Studied IP Telephony Numbering - based on ETSI Tiphon Request
 E.164/X.121 Interworking Arrangement
 Advisor to ITU-TSB as Global Resource Registrar
 Report on Numbering Plans for GII
 Carrier/Service Provider Selection Supplement
 Number Portability Supplement
 Resources for Groups of Countries
 Resources for Trials
 INMARSAT SNAC
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NNA Expertise and Experience
Numbering/Dialing Plan Design and Utilization
Numbering Plan Administration and Management
Numbering Requirements for
Services/Capabilities
Network Operations
Numbering Impacts on Networks
Regulatory Impacts of Numbering/Dialing Issues
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E.164 Numbers - Format & Functions(1/3)
 History
 Available since 1964 as international telephony number plan
 Has evolved to enable and conform to new technologies, e.g. ISDN,
Intelligent Network, ATM, etc.
 Three formats available (differentiated with Country Code)
 Geographical (Switzerland, North America, etc.)
Country Code
National Destination Code
Subscriber Number
responsibility of each country
or geographical area
ITU
 Global service (e.g., International Freephone Service, etc.)
Country Code
Global Subscriber Number
ITU responsibility
 Network (BT, MCIWorldcom, etc)
Country Code
Identification Code
ITU responsibility
Subscriber Number
responsibility of
each network
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E.164 Numbers - Format & Functions(2/3)
 Typical Functions
 Identify a terminating network and a customer’s physical interface of
telephone / ISDN
 Identify customer premises connected to an interface (dial-in)
 Identify services and customers (freephone/ mobile)
E.164 number
eg. 800XXXXXXXX
Logical
Name like
E.164 number
translation
eg. 41227305887
Physical
Address like
 A Trend of E.164 (increasing “naming” role)
 Created as “address” for telephony
 Today, use of E.164 number as “name” is increasing:
- Intelligent Network Services
- Number Portability
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E.164 Numbers - Format & Functions(3/3)
 Dialing and Sub-addressing
 ITU-T terminology “prefix” is not a part of “E.164 number”
Number
Prefix
 Prefixes determine the following format of E.164 number
International Prefix
CC
National Prefix
NDC
SN
NDC
SN
 Sub-addresses provide additional address information
E.164 Number
Sub-address
 Security
 E.164 numbers are transported in secure dedicated signalling network
 Calling Line Identification (Caller ID) is provided / verified by network
operators
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E.164 advantages
Simplicity
Language neutral & Special characters unnecessary
Supported by simple terminals
Administration
Unambiguous administration
Generally no explicit linkage between digits and an
organization
Security
Competition
Mechanism available to select transit network operator
based on a caller’s choice
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NN&A For New Technologies - Example
of Collaborative Effort
 E.191, B-ISDN Addressing
 Created strong linkage with ATM Forum
 Organized presentations in both Forums (ITU & ATM)
– Gained knowledge of each other’s perspective
– Broke down barriers and mistrust
 Ongoing relationship - regular meeting updates
 Cross fertilization of ideas through frequent communication
 Identified gap for global address authority
 Filled that gap - development of ITU IND
 Separation and definition of Name, Number, and Address
 Re-naming E.191 to B-ISDN Addressing to accommodate ATM
terminology
 Recognition and promotion of the Addressing and Routing linkage
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2000-2005 Work Plan
 Continuation/Conclusion of Projects Shown in “Scope of Work” and
“Successful Issue Resolutions”
 Global Evolution of NN&A
 Predict evolution of services, technologies, capabilities, and networks
 Define NN&A in the context of the predictions
 Develop a NN&A scheme for the future
 NN&A for Interworking Between E.164 & IP Address-Based Networks
 Assumes convergence of existing telecom networks and IP addressbased networks
 Develop NN&A mechanism(s) to support interworking
– Near-term: determine use of E.164 resources by IP address-based
networks
– Long-term: study potential convergence of NN&A schemes for all
international networks
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