In-Band Signaling: Dual-Tone Multifrequency Dialing

denzuko June 5, 2019, 5:31am #1

Hackaday – 5 Sep 17

In-Band Signaling: Dual-Tone Multifrequency Dialing

One late night many decades ago, I chanced upon a technical description of the Touch-Tone system. The book I was reading had an explanation of how each key on a telephone sends a combination of two…

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