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Seven-digit dialing is a telephone dialing procedure customary in some territories of the North American Numbering Plan (NANP) for dialing telephone numbers in the same numbering plan area (NPA). NANP telephone numbers consist of ten digits, of which the leading three are the area code.
The telephone number consists of a three-digit central office (or exchange) code and a four-digit station number. The combination of an area code and the telephone number serves as a destination routing address in the public switched telephone network (PSTN).
Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan. Zone 8 uses four 2-digit codes (81, 82, 84, 86) and four sets of 3-digit codes (80x, 85x, 87x, 88x) to serve East Asia, South Asia and special services. 83x and 89x are unallocated.
National conventions for writing telephone numbers vary by country. 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 ...
A Swiss rotary telephone dial from the 1970s showing the telephone's number (94 29 68), along with those of various local emergency services Telephone numbers for sale in Hong Kong A telephone number is a sequence of digits assigned to a landline telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile ...
In smaller communities with four- or five-digit numbers and a single city exchange, central office names appeared for the first time in the late 1950s, and then solely to match the North American direct distance dial standard of a three-digit area code and seven-digit local number.
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