The bt converse 1300 is fully pbx working has 100 name and number memory on hook dialling call timer access code and secrecy it also operates from battery powersennheiser sh 230 monaural headsetthis over the head monaural headset39s lightweight construction is perfect for any type of office or professional communication with headband adjustable on both sides for individually preferred positions and a self adjusting ball mounted speaker capsule to allow for perfect fitting to the ear