Remove the telephone cable from the landline phone's base. Plug the telephone cable into the "Tel in" socket on the telephone dialing module.
Plug an end of a telephone cord into the "Tel out" socket on the telephone module. Plug the other end into the landline phone's base. Plug the module's power cord into an outlet.
Program the module to dial a telephone number of your choice. Record a message using the module's microphone to play when the person at the other end answers.
Press the "Sync" button on the module to sync it with the existing wireless alarm system.
Disarm the wireless alarm's control panel by entering the correct password. Navigate through the menus to the "input" menu. Press the "Sync" button on the touch-screen LCD panel to sync the alarm system with the telephone module. Return to the main menu and re-arm the alarm system by entering the password again.