On Fri, 28 Feb 2020 14:53:36 -0500, Bob Bridges wrote: > >And I remember first discovering by experiment that all a rotary phone does is >put a counted number of clicks onto the line - and that I could "dial" a >number equally well by just tapping on the receiver to simulate the clicks. >... > Likewise, I wrote a program that can (sometimes) audio-dial a touch tone phone by generating the right beeps with a finite difference procedure.
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