Voipone of the top of the range ip system phones for the panasonic kxtde system as it is an ip system phone it needs to be connected to a lan and allocated an ip address to work if it is plugged into a standard extension or telephone line then the phone will not function self labelling keysnext to the programmable buttons is an lcd that displays the information of each button this is more convenient than using paper to write on the telephone what has been programmed into the button the disp