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Prior to the toll-free long distance market was opened to competition after 1986, a customer may have had a multi-carrier toll free number assigned by the Local Exchange Company for intrastate callers and an order placed with a long distance company for interstate callers.
Modern toll-free telephone numbers, which generate itemized billing of all calls received instead of relying on the special fixed-rate trunks of the Bell System's original Inward WATS service, depend on ANI to track inbound calls to numbers in special area codes such as +1-800, 888, 877, 866, 855, 844, and 833 with 822 reserved for future toll free use (United States and Canada), 1800 ...
The first direct-dialed long-distance telephone calls were possible in the New Jersey communities of Englewood and Teaneck.Customers of the ENglewood 3, ENglewood 4 and TEaneck 7 exchanges, who could already dial telephone numbers in the New York City area, could place calls to eleven major cities across the United States by dialing the three-digit area code and the seven-digit directory number.
PSTN network topology is the switching network topology of a telephone network connected to the public switched telephone network (PSTN).. In the United States and Canada, the Bell System network topology was the switching system hierarchy implemented and operated from c. 1930 to the 1980s for the purpose of integrating the diverse array of local telephone companies and telephone numbering ...
Interstate long-distance or inter-LATA interstate long-distance, the most common group, is the one for which long-distance carriers are usually chosen by telephone customers. Another form of long-distance call, increasingly relevant to more U.S. states, is known as an inter-LATA intrastate long-distance call. This refers to a calling area ...
Three weeks later, Coy published a list of New Haven's 50 phone subscribers (names of people and businesses only, as phone numbers didn't yet exist): the first-ever phone directory.
The expansion of the North American Numbering Plan (NANP) is the anticipated requirement for providing more telephone numbers to accommodate future needs beyond the pool of ten-digit telephone numbers. Ten-digit telephone numbers have been in use in the United States and Canada in long-distance telephone service since the 1950s.
A class-4 switch that connects class-5 switches to each other, but not to the long-distance network, is called a "local tandem." The majority of class-4 switches in the Bell System during the 1950s and 1960s used crossbar switches , such as the Crossbar Tandem (XBT) variant of the Number One Crossbar Switching System , or 1XB switch .