E.164

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E.164 is an ITU-T recommendation which defines the international public telecommunication numbering plan used in the PSTN and some other data networks. It also defines the format of telephone numbers. E.164 numbers can have a maximum of fifteen digits and are usually written with a + prefix. To actually dial such numbers from a normal fixed line phone, the appropriate international call prefix must be used.

The title of the original and revision 1 was "Numbering Plan for the ISDN Era".

Contents

Categories

This recommendation provides the number structure and functionality for the three categories of numbers used for international public telecommunication:

For each of the categories, it details the components of the numbering structure and the digit analysis required to successfully route the calls. Annex A provides additional information on the structure and function of E.164 numbers. Annex B provides information on network identification, service parameters, calling/connected line identity, dialing procedures, and addressing for Geographic-based ISDN calls. Specific E.164-based applications which differ in usage are defined in separate recommendations.

The number categories are all based on a fifteen-digit numbering space (excluding prefixes; before 1997, only twelve digits were allowed). They are as follows:

Number structure for geographic area

Number structure for global services

Number structure for networks

Number structure for groups of countries

Recommendations contained in E.164

E.164.1

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