A: IN THE CASE THAT A TELEPHONE IS ILLEGALLY BRIDGED TO A USERS TELEPHONE FOR THE PURPOSE OF TAPPING OR ILLEGAL USE OF TELEPHONE IT CAN BE DETECTED AND PREVENTED FROM ILLEGAL USE. THIS FEATURE ONLY REFERES TO ILLEGAL WIRE TAPPING EQUIPMENT SUCH AS SERIES AND PARALLEL TELEPHONE TAPS WHICH REQUIRE A DEVICE (TRANSMITTER AND MICROPHONE) BE CONNECTED DIRECTLY TO A TELEPHONE WIRE. THOSE TYPES OF TAPS USUALLY INVOLVE THE TAPPING DEVICE DRAWING POWER FROM THE TELEPHONE LINE. THE DRAWAING OF POWER FROM A TELEPHONE LINE IS HOW DEVICES LIKE THE DD801 KNOW AND CAN ASSIST WITH OVERCOMING A TELEPHONE TAP. YOU CAN MONITOR TAP DETECTION USING HEADPHONES LISTENING FOR ANY BEEP NOTIFICATION INDICATING A TAP BEING DETECTED.