e.164 the international public telecommunication numbering plan scope and structure

Workshop on Numbering Plan PoliciesSana’a – Yemen, 13 – 15 September 2004

CoE/ARB

E.164 The International Public Telecommunication Numbering Plan

Scope and Structure

Abdelfattah ABUQAYYAS

CoE/ARB Coordinator

[email protected]

ITU - BDT


CoE/ARB

ITU and E.164 What is the ITU?

Iinternational organization where governments and private sector coordinate global telecom networks and services

Founded in 1865, it is the oldest specialized agency of the UN system 189 Member States, 650 Sector Members, 75 Sector Associates Website: http://www.itu.int

What is E.164? ITU-T Recommendation E.164: “The international public

telecommunication numbering plan” Tied to treaty obligations (specific roles and obligations defined for ITU

Member States and ITU-T TSB Director) Defines number structure and functionality for principal categories of

numbers


CoE/ARB

E.164: The international public telecommunication numbering plan

Recommendation E.164 provides the number structure and functionality for the three categories of numbers used for international public telecommunication.

All telephone numbers can be called if a number is dialled of upto 15 digits, made up of a one to three digit country code (CC), followed by the subscriber number (SN).

The first few digits of the subscriber number can be a so called National Destination Code (NDC), which can identify the type of telephone number you're calling.

All country codes are assigned by ITU in Recommendation E.164 Within Recommendation E.164 four categories of telephone numbers are

recognized, namely for: National (Geographical areas) telephone services Global telephone services International networks Group of countries

http://www.numberingplans.com/index.php?goto=guide&topic=cc

http://www.numberingplans.com/index.php?goto=guide&topic=sn

http://www.numberingplans.com/index.php?goto=guide&topic=ndc


CoE/ARB

E.164 Scope E.164 provides the number structure and functionality for the following three

categories of International Public Telecommunication numbers (E.164 numbers). Geographical Global Networks areas services

In addition to these three categories the following two new categories will hopefully appear in a revised E.164.

Groups of Trialscountries


CoE/ARB

Examples of E.164 Resources Geographic areas

ITU Member States, including integrated numbering plan involving more than one (e.g. +1)

Global Services Universal International Freephone Numbers (+800) Universal Personal Telecommunications (+878 + 2 digit IC)

Networks Global Mobile Systems (+881 + 1 digit IC) Shared code for Networks (+ 882 + 2 digit IC)

Groups of Countries ETNS

For each of the categories, it details the components of the numbering structure and the digit analysis required to successfully route the calls


CoE/ARB

Structures and optionsNational telephone services

An international public telecommunication number (for geographic areas) is also referred to as the national significant number (NSN), which consists of the country code CC, national destination code NDC and the subscriber number SN. The country code consists of one to three digits and the national destination code is optional. Number structure for geographical areas

CC NDC SN

•CC: country code (1 – 3 digits) •NDC: national destination code •SN: subscriber number

CC

NDC + SN

http://www.numberingplans.com/index.php?goto=guide&topic=nsn


CoE/ARB Structures and optionsNumbers for geographical areas, formatsfor national use. Option 1: separated NDC and SN

SNNDC

SNCC NDC

SN


CoE/ARBStructures and options

Numbers for geographical areas, formatsfor national use. Option 1: separated NDC and SN

NDC

SN

SN

CC NDC

SNNational prefix International prefix



Numbers for geographical areas, formatsfor national use. Option 2: connected NDC and SN

NDC

SN

SN

CC NDC

The leading digits of the national subscribernumbers indicates services and/or geography.

National subscriber number



Numbers for geographical areas, formatsfor national use. Option 2: connected NDC and SN

SN

SN

CC NDC

NDCInternational prefix

When NDC and SN are inseparably connectedto form a single dialling sequence, a national prefix is not necessary.



Numbers for geographical areas, formatsfor national use.

Option 1 and 2 are normally used in parallel,with option 1 for geographic numbers andoption 2 for national location independentnumbers.

Option 2 can however be used for both typeof numbers nationally.


CoE/ARB

Structures and optionsGlobal telephone services

An international public telecommunication number for global telephone services consists of a three digit country code and global subscriber number. The country code is always in the the 8xx or 9xx range

Numbers for Global Services

CC GSNCountry code

(3 digits)

Global significant number (Max 12 Digits)

Global significant number

•The leading digits of GSN may indicate some service specific characterics.

•The global services have only one international format, but access to global services

•CC: Country Code for global service (800, 808, 878, 979)•GSN: Global Significant Number •SN: subscriber number


CoE/ARB

Structures and options Numbers for Networks

Network is inter- nationallly interconnected physical nodes and operational systems operated and maintained by one or more ROAs to provide public Telecommunication service

CC1 CC2CC3

CC4


CoE/ARB

Structures and options International networks

An international public telecommunication number for international networks consists of three digit country code, a network identification code and a subscriber number. The country code is always in the 8xx range. The identification code is one to four digits. Numbers for Networks

CC SNICCC IC + SN

CC: Country Code for Networks (882) - 3 digits

IC: Identification Code - 1 to 4 digits

SN: Subscriber Number - Max 15-n (number of digits in CC+IC) digits



Numbers for Networks, optional formats

CC IC SN

IC SN

SN Network internal

Incoming to Network

Between Networks

To use the three formats for the mentioned purposes each Network would have to create their own Network internal prefixes.


CoE/ARB

Structures and options Numbers for Groups of countries

Numbers for Groups of countries

CC GIC SN

3 digits Max 11 digits

CC: Country Code for Groups of countries (tbd)GIC: Group Identification CodeSN: Subscriber Number

1 digit


CoE/ARB

Structures and options Numbers for Trials

Numbers for Trials

CC TIC SN

3 digits Max 9 digits

CC: Country Code for Trials (991)TIC: Trial Identification CodeSN: Subscriber Number

3 digits


CoE/ARBNumbering for geographic areas

Prefixes are not part of the E.164 numberand are not signalled over internationalboundaries.E.164 indicates preference for the use of digit0 as national prefix.The digit analysis should not be more than 7digits to determine the country of destination, the most appropriate routeing and the proper charging.


CoE/ARB

Planning advices for geographic areas

The national numbering plans should be designed:a) to allow for generous provision of future growth;b) so that the national networks be accessible to

subscribers in other countries by means of international dialling procedures.

c) so that subscribers would always be called by the same national number regardless of where the call is originated from within a national numbering plan.

It is recommended that notification of national numbering changes be submitted at least 2 years in advance.


CoE/ARBInternational prefix

E.164 recommends that Administrations that are revising their numbering plansadopt 00 as an international prefix.

CC1 CC2CC3

CC4

00 + E.164 numbers


CoE/ARBFrequently asked question

When is a number an E.164 number?When it satisfies the following:

1. It has to be part of an ITU defined fixed international hierarchical structure.

2. It has to be maximum 15 digits.3. It has to be unique in its international

format.


CoE/ARB

Case Study - Singapore The National Numbering Plan provides a set of rules and guidelines for assigning

numbers to Public Switched Telephone Network (PSTN) and Radio Network. The Plan also describes the assignment of numbers to international, trunk, emergency

and special services such as voice mail, Intelligent Network (IN) services. Under the plan, numbers are categorized in various services under the National

Numbering Plan according to the first digit. The structure of the national number generally complies with the relevant (ITU-T)

Recommendations. IDA, as the regulator for telecommunications, controls and manages the National

Numbering Plan to ensure that the number allocation process is fair and transparent. IDA has to strike a balance in ensuring that the limited number resources are used

efficiently and optimally and yet do not impose undue operational constraints on the telecommunication service providers.

The National Numbering Plan will be reviewed from time to time to ensure its continued relevance in light of technological advances and the introduction of new services


CoE/ARB

Case Study – Singapore Numbers with Leading Digit 0 and 1

Numbers with Leading Digit 0 Numbers beginning with the digit ‘0’ are reserved for international services such as

prefixes for International Direct Dial (IDD) service, Subscriber Trunk Dial (STD). The length of these prefixes is standardized at three digits. They are referred to as Level ‘0’ short codes.

Facility Based Operators (FBO) licensees are eligible for 3-digit access codes provided that they commit an overall investment in infrastructure of an amount not less than S$150 millions over the first 3 years from date of licensing. FBO licensees must use the access codes to provide service for the mass consumer market.

Numbers with Leading Digit 1 Numbers beginning with the digit ‘1’ are reserved for special services which includes

calls for operator assistance, service enquiry, voice information, IN services and access code IDD type of services. Their length generally ranges from four to five digits. They are referred to as Level ‘1’ short codes.

Only FBO licensees are eligible for level ‘1’ short codes. However, for Service-based Operator (SBO) licensees who propose to operate an International Simple Resale (ISR) service. they will be also be allocated from ‘15XX’ level.


CoE/ARB

Case Study – Singapore Numbers with Leading Digit 6 and 9

Numbers with Leading Digit 6 Numbers beginning with the digits ‘6’ are reserved for use as

ordinary PSTN numbers. The length of these numbers is standardized at eight digits.

A FBO licensee offering domestic telephony services are eligible for PSTN numbers.

Numbers with Leading Digit 9 Numbers beginning with the digit ‘9’ are reserved for three digit

emergency services and eight digit Radio Network numbers. FBO licensees offering Radio Network services including Public

Cellular Mobile Telephone Services, Public Radio Paging Services and Public Trunked Radio Services are eligible for Radio Network numbers.


CoE/ARB

THANK YOU

[email protected] – BDT

E.164 The International Public Telecommunication Numbering Plan

Scope and Structure

e.164 the international public telecommunication numbering plan scope and structure

Documents

national destination

subscriber number sn

national destination

subscriber number structures

digit country code cc

digit icshared code

numbering structure

type of telephone number