I replaced a merlin legend system with a DSX 80, and for some reason the T1 lines will not dial 1-800 numbers. I can dial local numbers fine. when I try to dial the 1800 numbers I get the phone company message saying, " your number cannot be completed as dialed " " please check the number and try your call again". I also have POTS lines on the system and they dial just fine. Any ideas what could be causing this. Thanks