Hi Gary,
I understand that P4 and G4 ports are not programmable but what does this mean
“You need an FXS at the second location to talk to the FXS at the first one.”
I have P4 in remote client , I have a G4 and P4 in my house. How should I connect these so I can use fxo of G4 to call home and then call destination , at the same time when at home call using phone P4.