Visitors at the door or gate press the Doorphone button.  Programmed phones on the system ring (triple-ring)

To answer, pick up the ringing phone and you are connected

To open the door/gate, press 5

To call a Doorphone, Intercom *31 plus 2-digit door number 01 to 16.  Door one would be *3101, door two would be  *3102 etc.

To simply open or unlock a door/gate if you are not talking with the visitor press STAR 55 and the 2-digit door number.  For example, door one would be *5501, two would be *5502 etc.

KX-TDA 50 can have up to 4 door phones and 4 door/gate openers.

KX-TDA 100 can have up to 8 door phones and 8 door/gate openers.

KX-TDA 200 can have up to 16 door phones and 16 door/gate openers.