This went over my head at first, but I really like it. So for those like me: it converts network traffic into audio output.
YouTube explainer: https://youtu.be/vfgySTaM1TI
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YouTube explainer: https://youtu.be/vfgySTaM1TI
When a call came in, before the phone would ring, the radio would emit this very clear tri di di dit dah dah. But only when the phone was very near the radio.