I've always wanted to do something like that.
I hope you keep this thread updated with all the information and work you do

When I moved out I wanted to have a free payphone as my home phone.
I ended up not getting home phone at all and just a mobile, but I'll eventually get a home phone and I plan on getting a payphone to do it.
There must be some sort of common wiring between a home and pay phone. I hope you figure it out.
Good luck.