Voip the panasonic kx nt136 ip system telephone is a voip system phone for the panasonic kxtda telephone system it needs to be allocated an ip address for it to function as it will not work on a standard telephone extension or telephone line it takes its power through the ethernet connection on the network poe but if your network is not powered you will need to purchase a power supply as well backlit display the system telephone has a large 6 line x 24 character backlit