I have a situation with my installation that's causing some trouble. One of the DAHDI FXO ports is connected to an automatic ringdown circuit provided by the phone company.
The line is split so that it both goes to the PBX and to two phones in the station. One is a public phone outside, the other is a phone in the elevator.
I'm having an issue where voltage varies and it will start the phone ringing and complete the circuit and call our dispatcher.
So my question, is there anything I can do to stop this? Can I edit a setting to raise the voltage threshold to trigger the ringer, or put a line filter?