I posted this topic in the alarm forum too but thought I would post it here since it involves phone lines...I can get the alarm techs to grasp the way phone companies see off hook line voltage. The alarm techs think the off hook voltage should be an exact or a minimum voltage. I keep telling them that the off hook voltage will vary and the LEC looks more at the loop current...here's the post on the page/alarm forum. Any ideas will be welcome...

The line cut monitor used on our alarm systems will think any off hook line voltage below 10 volts is a cut phone line.
All the phone lines used on the alarms are shared with phone system use via an RJ31X jack...pretty standard stuff.

Is there a line cut monitor unit out there available that is adjustable so it will trip at a lower off hook line voltage other than 10 volts?

Thanks, DT98