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DTMF: Revision history

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4 May 2026

  • curprev 01:2301:23, 4 May 2026 Kevin talk contribs 4,507 bytes +4,507 Created page with "'''DTMF''' ('''Dual-Tone Multi-Frequency''') is a signalling system used by telephone networks to represent keypad input as pairs of simultaneous audio tones. It was developed by Bell Labs in the United States and introduced commercially in November 1963 under the registered trademark Touch-Tone.<ref>''Dual-tone multi-frequency signaling'', Wikipedia, [https://en.wikipedia.org/wiki/DTMF_signaling https://en.wikipedia.org/wiki/DTMF_signaling]. Accessed 4 May 2026.</ref> D..."
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