We are having intermittent dial out problems on our TDM400. Most of the time it gives us the failed call recording from telco stating that we need to dial a one for that number. But if we keep trying the same number it works once in a while. This fails pretty much 99% of the time. If we put a POTS phone on the circuit it dials out just fine 100% of the time.
Does anyone have any ideas about where to start. Any help would be appreciated.