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A push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones.. Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in ...
A 220 Trimline rotary desk phone, showing the innovative rotary dial with moving fingerstop Early Touch Tone Trimline with round buttons and clear plastic backplate and round non-modular handset cord Redesigned touch-tone desk model Trimline, manufactured on January 9, 1985 The Trimline 2225, one of the last phones made at the Indianapolis Works in 1986 Early foreign made Trimline, December ...
The base station may also have a numeric keypad for dialing, and a display for caller ID. In addition, answering machine function may be built in. [37] The cordless handset contains a rechargeable battery, which the base station recharges when the handset rests in its cradle. Muilt-handset systems generally also have additional charging stands.
Plain Old Telephone Service (POTS), or Plain Ordinary Telephone System, [1] is a retronym for voice-grade telephone service that employs analog signal transmission over copper loops. The term POTS originally stood for Post Office Telephone Service , as early telephone lines in many regions were operated directly by local Post Offices .
This allowed blurring the distinction of key telephone system versus PBX telephone system. Many features such as Direct Inward Dial, Caller ID, Automatic Call Distribution, and Call Accounting were designed off the larger Meridian 1 PBX, DMS-100 and Meridian SL-100 as opposed to being developed as an independent system. [dubious – discuss]
Caller-ID system response sounds in various cases: analog, ISDN and digital PBX Caller identification (Caller ID) is a telephone service, available in analog and digital telephone systems, including voice over IP (VoIP), that transmits a caller's telephone number to the called party's telephone equipment when the call is being set up.
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