The phone saying "no line" means it isn't seeing the 50 volts from the OBi. Nothing to do with the internet side of things and nothing in the OBi202 configuration settings can affect that. Phone cord not plugged in properly, faulty phone cord, faulty phone or faulty OBi202.
And what's with the DMZ and 192.168.1.0? You should not use 0 at the end of an IP address. Using the DMZ is rarely necessary. Did it work without being in the DMZ before the furniture moves?