This is more straightforward than I'd think: detect when the handset is picked up, decode the dialed numbers, then use the handset as a microphone and speaker.
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This is more straightforward than I'd think: detect when the handset is picked up, decode the dialed numbers, then use the handset as a microphone and speaker.
You can even put a bitcoin node in a rotary phone hahahaha https://versteegg.medium.com/wait-is-this-a-rotary-bitcoin-node-b16ca9b51f18