Thanks everyone! Cox is here. Testing the modem or pots - seems to be going OK - He did see the lines not hanging up prior to the test. After that - performed a series of test and seems to be working again - No stuck lines or trunk. He is suspecting it is our Intertel system. More to follow. Wondering if i have to re - seat the cards?

If the phone system is grabbing the line and not releasing it, even though we did hang up. What would be a good starting point to troubleshoot it? besides resetting the modem. Because that seems to work every time.
I know i am dealing with a very old system but this one for all i know its built like a tank!

Last edited by MarvinACE; 10/21/20 12:20 PM.