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DTMF (Dual-Tone Multi-Frequency signaling) - Glossary | MDN 1/3 https://developer.mozilla.org/en-US/docs/Glossary/DTMF reference web, html, css, javascript, documentation 2026-05-05T05:29:12.707923+00:00 kb-cron

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  1. Glossary
  2. DTMF (Dual-Tone Multi-Frequency signaling)

DTMF (Dual-Tone Multi-Frequency signaling)

Dual-Tone Multi-Frequency (DTMF) signaling is a system by which audible tones are used to represent buttons being pressed on a keypad. Frequently referred to in the United States as "touch tone" (after the Touch-Tone trademark used when the transition from pulse dialing to DTMF began), DTMF makes it possible to signal the digits 0-9 as well as the letters "A" through "D" and the symbols "#" and "*". Few telephone keypads include the letters, which are typically used for control signaling by the telephone network. Computers may make use of DTMF when dialing a modem, or when sending commands to a menu system for teleconferencing or other purposes.

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