I called into my equipment provider but they did not know what the problem could be. I am very certain it started when we switched carriers about 2 months ago.

I now recall someone telling me that a line we have forwarded all the time to a remote office was not working about a month or so ago and when I called it with my cell (blocked caller ID) it worked so I thought it was fixed. Evidently not. It is rarely used so we did not pick up on it until now.

Any ideas on what I should ask my Telco provider to check?