I probably searched a lot within the Intertel forum about this issue, but i can't pinpoint or phrase it correctly. Our issue is that we have lines that remain lit even if no one is using a line. When i check the keys - it gives me a 94002-003 so on. for the ones that are lit. What we usually perform to get rid of it is to reset our Cox box and the lines will eventually be free. Then the issue comes back after a day or two. Cycle repeats to clear it.

Have you had this issue with your Intertel? How can i resolve it?