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Priority call, and priority ring also refer to calling features which give a distinctive ring to calls from telephone numbers chosen by the subscriber. The service may require a subscription from their telephone company. To set up priority call, the subscriber dials the vertical service code *61 and follows the instructions. [1] [2]
Distinctive ring, marketed under a variety of names, is a service offered by a telephone company that establishes additional telephone numbers on the same line as an existing number, each number ringing with a distinctive ringing pattern. Typically, the original number rings with the standard ring pattern that is common to the nation where the ...
As CLASS was an AT&T trademark, the term vertical service code was adopted by the North American Numbering Plan Administration. The use of vertical is a somewhat dated reference to older switching methods and the fact that these services can only be accessed by a telephone subscriber, going up ( vertically ) inside the local central office ...
AT&T Merlin five-button telephone (voice terminal) manufactured in early 1980. 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 the Bell System in 1984, it was rebranded and later also supplied by Lucent and Avaya.
Room 641A is a telecommunication interception facility operated by AT&T for the U.S. National Security Agency, as part of its warrantless surveillance program as authorized by the Patriot Act. The facility commenced operations in 2003 and its purpose was publicly revealed by AT&T technician Mark Klein in 2006. [1] [2]
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Emergency service response codes are predefined systems used by emergency services to describe the priority and response assigned to calls for service. Response codes vary from country to country, jurisdiction to jurisdiction, and even agency to agency, with different methods used to categorize responses to reported events.
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