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A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s – this replaced rotary dialing , that had been developed for ...
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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 ...
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Using a toll-free number ensured that the phone being used for access would not be billed. When the call began to ring, the caller would hold the blue box speaker over the microphone in the handset and use the box to send the 2600 Hz tone (or 2600+2400 Hz on many international trunks followed by a 2400 Hz tone).