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The International Telecommunication Union (ITU) publishes a recommendation entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses. Recommendation E.123 specifies the format of telephone numbers assigned to telephones and similar communication endpoints in national telephone numbering plans.
This format includes the recommendation of prefixing international telephone numbers with a plus sign and using only spaces for digit grouping. The presentation of a telephone number with the plus sign indicates that the number should be dialed with an international calling prefix, in place of the plus sign. The number is presented starting the ...
Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
Microsoft canonical address format for telephone numbers [2] [3] derives from E.123 international notation by allowing explicit indication of area code with parentheses. The canonical format is used by the Telephony API (TAPI) , a Windows programming interface for dial-up fax, modem, and telephone equipment.
In the international telephone network, the format of telephone numbers is standardized by ITU-T recommendation E.164. This code specifies that the entire number should be 15 digits or shorter, and begin with an international calling prefix and a country prefix.
Each three-digit area code has a capacity of 7,919,900 telephone numbers (7,918,900 in the United States). Despite the widespread use of fictional telephone numbers of the form NYX 555-XXXX , only the block of line numbers from 0100 through 0199 are reserved specifically for this purpose, leaving the rest available for assignment.
Brazil (see Telephone numbers in Brazil § International calls) Cambodia (001 – Telecom Cambodia, 007 – Royal Telecom International) Colombia (005, 007, 009) Indonesia (001, 007, 008) South Korea (see Telephone numbers in South Korea § International call carrier codes) Taiwan (see Telephone numbers in Taiwan § International dialling)
In several European countries, a different strategy prevailed, known as the open numbering plan, which features a variance in the length of the area code, the local number, or both. [3] United States telephone numbers often included letter prefixes and telephone exchange names, which were more easily memorable for users than long digit sequences.