I purchased an old crank phone at a second-hand store last year that I'm planning to add a Google Voice AIY Kit. By modifying the keyword to respond to "operator" or by the turn of the hand crank it will work more like the original phone (simulation at least). I will be using a Raspberry Pi 3 with the Google Voice AIY kit and will make modifications for microphone and speaker to use the earpiece and voice receiver. I plan to use a relay for a button by connecting it to the output of the Crank Magneto, which can produce approx. 80 to 100 volts AC.