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.

Interconnection Types
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