1) Enter programming by pressing the installer code (default 98765) followed by #, 0
2) Enter 71, [Reset/*], 5 + # to disable phone number 1
Enter 72, [Reset/*], 5 + # to disable phone number 2
3) Enter 75, 000000 + # to disable communication format for Line 1
4) Enter 76, 000000 + # to disable communication format for Line 2