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  2. Bell System Practices - Wikipedia

    en.wikipedia.org/wiki/Bell_System_Practices

    A typical volume of Bell System Practices from the 1970s. The Bell System Practices ( BSPs) is a compilation of technical publications which describes the best methods of engineering, constructing, installing, and maintaining the telephone plant of the Bell System under direction of AT&T and Bell Telephone Laboratories. [1]

  3. AT&T Merlin - Wikipedia

    en.wikipedia.org/wiki/AT&T_Merlin

    AT&T Merlin is a corporate telephone system by American Telephone and Telegraph (AT&T) that was introduced in late 1983, when it was branded American Bell Merlin. After the breakup of AT&T in 1984, it was rebranded and later also supplied by Lucent and Avaya . The system was designed at the beginning of the 1980s prior to the Bell System ...

  4. 5ESS Switching System - Wikipedia

    en.wikipedia.org/wiki/5ESS_Switching_System

    5ESS Switching System. 5ESS used in a mobile telephone network. The 5ESS Switching System is a Class 5 telephone electronic switching system developed by Western Electric for the American Telephone and Telegraph Company (AT&T) and the Bell System in the United States. It came into service in 1982 and the last unit was produced in 2003.

  5. Porting Authorisation Code - Wikipedia

    en.wikipedia.org/wiki/Porting_Authorisation_Code

    Porting Authorisation Code. Porting Authorization Code ( PAC) is a unique identifier (normally 9 characters long and in the format "ABC123456") used by some mobile network operators to facilitate mobile number portability (MNP). This allows users to retain their mobile telephone number when switching operators.

  6. Local number portability - Wikipedia

    en.wikipedia.org/wiki/Local_number_portability

    Local number portability. Local number portability ( LNP) for fixed lines, and full mobile number portability ( FMNP) for mobile phone lines, refers to the ability of a "customer of record" of an existing fixed-line or mobile telephone number assigned by a local exchange carrier (LEC) to reassign the number to another carrier ("service provider ...

  7. Mobile number portability - Wikipedia

    en.wikipedia.org/wiki/Mobile_number_portability

    Overview. Mobile number portability is implemented in varying ways across the globe. The international and European standard implements "recipient-led" porting, in which a customer wishing to port a telephone number contacts the new network (recipient), which sends the number portability request (NPR) to the current network operator (donor).

  8. Telephone number pooling - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_pooling

    Telephone number pooling. Telephone number pooling, thousands-block number pooling, or just number pooling, is a method of allocating telephony numbering space of the North American Numbering Plan in the United States. The method allocates telephone numbers in blocks of 1,000 consecutive numbers of a given central office code to telephony ...

  9. AT&T Corporation - Wikipedia

    en.wikipedia.org/wiki/AT&T_Corporation

    AT&T Communications. AT&T Corporation, commonly referred to as AT&T, an abbreviation for its former name, the American Telephone and Telegraph Company, was an American telecommunications company that provided voice, video, data, and Internet telecommunications and professional services to businesses, consumers, and government agencies.

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