Dial Tone - Lexmark X4270

Question

I'm setting up this new unit. First step is to wire to phone line and connect power supply. After doing this I lifted the phone to check for a dial tone. That part was fine, but on hanging up, it does not break phone connection and I soon get the "If you want to make a call, please hang up" message from the phone company. Only way to cut connection is to unplug phone wire from the phone jack. Can this unit be saved?