1. Numbering, Naming, and Addressing at ITU-T Study Group 2 (SG2)
Presentation by:
Fred Gaechter
Rapporteur, Q1/2
Document IPW-3

2. 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 Study Period

3. 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

4. Work Methods and Considerations
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

5. Scope of Work
Development, Maintenance, and Application of E-Series Numbering, Naming and Addressing Recommendations
E.164
E Criteria & Procedures for the Reservation, Assignment & Reclamation of E.164 CCs and ICs
E Application of E.164 for UPT
E Application of E.164 Numbering Plan for UIFN
E Application of E.164 Numbering Plan for UIPRN
E Application of E.164 Numbering Plan for UISCN
E.190
E B-ISDN Numbering and Addressing
E Criteria & Procedures for ITU-Defined AESAs
E E.164 Country Code Expansion
E ITU Global Numbering Resource Administration
E International Identification Plan for Mobile Terminals and Mobile Users

6. 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)

7. Successful Issue Resolutions
Expanded Numbering Resource Functionalities
E Geographic to Services, Networks, and GMSSs
E 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

8. 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

9. 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.)
Global service (e.g., International Freephone Service, etc.)
Network (BT, MCIWorldcom, etc)
Country Code
National Destination Code
Subscriber Number
responsibility of each country
or geographical area
ITU
Country Code
Global Subscriber Number
ITU responsibility
Country Code
Identification Code
Subscriber Number
responsibility of
each network
ITU responsibility

10. 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) Logical Physical Name like 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
E.164 number
eg. 800XXXXXXXX
E.164 number eg
translation

11. E.164 Numbers - Format & Functions(3/3)
Dialing and Sub-addressing
ITU-T terminology “prefix” is not a part of “E.164 number”
Prefixes determine the following format of E.164 number
Sub-addresses provide additional address information
Security
E.164 numbers are transported in secure dedicated signalling network
Calling Line Identification (Caller ID) is provided / verified by network operators
Prefix
Number
International Prefix CC
NDC SN
National Prefix
NDC SN
E.164 Number
Sub-address

12. 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

13. 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

14. 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 address-based 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