Hello, I have a DSC Power Series 632 system with a 1555mx main board. The system is monitored and TLM is enabled. I am getting a Trouble Code #3 whenever my phone line goes off hook. The trouble disappears when the phone goes back on hook. The monitor company is getting messages all day long about phone line being restored. I check the incoming voltage for T&R on the panel. I have 50v dc when the phone is on hook and about 6.5v dc when the phone is off hook. The system communicates just fine with the monitoring company. I am only having problems when I am trying to use my shared phone line. Any ideas???? Jason

i just bought a new house, and i will not connect to central, when they remove the telephone line . the troubble light on the alarm system is always on because it is searching for telephone line. i call ADT , and they charge me 70$ to come and remove the troubble light. i found that outragouse.. so.. if someone know how to do it.. let me know !! peter ! with a troublle light always on !!!!! lol :madhell: