DTMF Dialer
A touch-tone keypad that generates genuine DTMF dial tones — the same two-tone-per-key system real phones use.
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About this tool
Each key on a touch-tone phone is really two simultaneous sine tones — one from a low-frequency row and one from a high-frequency column — which is what lets a phone system tell every key apart reliably over a noisy line. Click keys to hear and build a dial string, or type digits directly.