Hacker News new | ask | show | jobs
by crtasm 919 days ago
No, the dialing on a rotary phone is done by quickly closing and opening the circuit (this means you can tap out numbers by hand on the switch that detects you hanging up the handset).

Press 1 to continue systems require the DTMF tones to be played down the line, either by the phone or any other device held up to it.