I was just refilling a prescription on the automated line and the thought just dawned on me. How do they know what buttons I’m pressing? Sorry if this is really dumb. I understand next to nothing about technology. Thanks
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You know those beeps that happen each time you hit a button? Those are [DTMF tones](https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling), and they can be decoded on the other side. The frequencies of each beep correspond to a number.
That system has been in place since touch-tone dialing was a thing.
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