Telephone keypad - Wikipedia
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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What is a Touch Tone Telephone? - Spiegato
A user can press a button on a phone’s keypad to emit a tone that is heard by the computer system to which he or she is connected, thereby relaying information or triggering a certain response.
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Keypad - Wikipedia
Keypads are found on devices which require mainly numeric input such as calculators, television remotes, push-button telephones, vending machines, ATMs, point of sale terminals, combination locks, safes, and digital door locks. Many devices follow the E.161 standard for their arrangement.