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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 ...
The common-audible ringing signals from the KSU would run through the energized relays to certain phones that would also ring if there was a power failure. The phone lines that terminated at the KSU were also terminated at these relays and in the event of a power failure, the relays would de-energize and switch the phone lines to the ringers of ...
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.
With manual service, the customer lifts the receiver off-hook and asks the operator to connect the call to a requested number. Provided that the number is in the same central office, and located on the operator's switchboard, the operator connects the call by plugging the ringing cord into the jack corresponding to the called customer's line.
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1971: AT&T submitted a proposal for cellular phone service to the U.S. Federal Communications Commission (FCC). 3 April 1973: Motorola employee Martin Cooper placed the first hand-held cell phone call to Joel Engel, head of research at AT&T's Bell Labs, while talking on the first Motorola DynaTAC prototype.
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 ...
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