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A door phone or door bell phone is a set of electrical and electronic elements used to handle communication between a resident in a house, apartment or villa and a guest outside. The device can also lock or unlock the door it has been configured to work with. Door phones have been used across a variety of commercial and residential buildings ...
By connecting a test telephone set, a technician calls the local telephone number of the automatic number announcement service. This call is connected to equipment at the central office that uses automatic equipment to announce the telephone number of the line calling in. The main purpose of this system is to allow telephone company technicians ...
Areas with step-by-step equipment processed the call one digit at a time as dialed by the caller, and thus needed a common prefix to distinguish long-distance dialing from local calls. The Bell System design choice was 1, but since 113 was in use for directory assistance, along with other 11x codes ("Repair" was 114)., [7] changes had to be ...
A telephone keypad using the ITU E.161 standard.. A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number.
The most widely used form is the interrupter bell, which is a mechanical bell that produces a continuous sound when current is applied. See animation, above. The bell or gong (B), which is often in the shape of a cup or half-sphere, is struck by a spring-loaded arm (A) with a metal ball on the end called a clapper, actuated by an electromagnet ...
Automatic number identification (ANI) [1] [2] is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes. Automatic number identification was originally created by the American Telephone and Telegraph Company (AT&T) for long distance service in the Bell System ...