notfred wrote:Nope, that's Hoot-n-Holler, which doesn't need a dial. What Ned has is a proper pulse tone dialling phone to plug in to an FXS POTS line. The big problem with them is the REN (to drive the solenoid hammering the bell) sucks.
Yup. On a traditional phone line, the ringing signal is 90 volts AC because it had to be capable of providing enough power to drive a hefty electromechanical ringer through a long run of thin (24 gauge IIRC) wire. REN (ringer equivalence number) determines how many phones you can connect to the same line and still have them all ring; connect too many old phones to the line and the current draw of the ringers and resistive losses in the wiring will prevent any of them from ringing.
Edit: And of course, this means that the base station of your modern cordless phone needs to have a circuit in it that can detect the presence of 90 VAC on the line, and turn that into a transmitted "ring" packet in whatever digital protocol it is using to talk to the handsets. All in the name of staying backward compatible with phones that were built well before our parents were born!