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   E.164 International Public Telecommunications Numbering Plan

The International Telecommunications Union (ITU), a division of the United Nations, has defined a world numbering plan recommendation, "E.164." The E.164 numbering plan defines the use of a country code (CC), national destination code (NDC), and subscriber number (SN) for telephone numbering. The CC consists of one, two or three digits. The first digit identifies the world zone. The number of digits used for telephone numbers throughout the world varies. However, no portion of a telephone number can exceed 15 digits. There are several "E" series of ITU numbering recommendations that assist in providing unique identifying numbers for telephone devices around the world.

This diagram shows the world (telephone) numbering plan recommendation, "E.164" developed by the International Telecommunications Union (ITU). This diagram shows the numbering plan divides a telephone number into a country code (CC), national destination code (NDC), and subscriber number (SN) for telephone numbering. The CC consists of one, two or three digits and the first digit identifies the world zone. This diagram shows that the local number can be divided into an exchange code (end office switch identifier) and a port (or extension) code.

 

E.164 International Public Telecommunications Numbering Plan

E.164 International Public Telecommunications Numbering Plan Diagram

   Public Switched Telephone Network - PSTN Terms

Interconnection Types
Switching

   Public Switched Telephone Network - PSTN Books

Introduction to Private Branch Exchange - PBX Book

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Introduction to Public Switched Telephone Networks - PSTN

This book describes public telephone technology and systems including local loop, digital loop, switches, multi-channel communication lines and signaling control systems. Discover the types of DSL including ADSL, ADSL2, HDSL, SDSL, and VDSL and how DSL can offer television services with thousands of channels.

$14.99 Printed, $11.99 eBook

Telecom Crash Course

Telecom for Dummies Telecom Management Crash Course
Telecom Crash Course
Steven Shepard,Paperback - REV, Edition: 2, English-language edition,Pub by McGraw-Hill Companies
Telecom for Dummies
Stephen P. Olejniczak,Paperback,Series: For Dummies Series, English-language edition,Pub by Wiley, John & Sons, Incorporated
Telecom Management Crash Course
P.J. Louis,Paperback, Edition: 1,Series: Crash Course Series, English-language edition,Pub by McGraw-Hill Companies

 

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