Cisco CP-8831-K9= Unified IP Conference Phone Base and Control Unit Session Initiation Protocol Adjustable ringing and volume levels, Adjustable display brightness, Application launch pad Auto-answer, Auto-detection of headset, Barge, Call forward Immediate divert, Join, Message-waiting indicator, Music on hold The conference station has a large high-resolution, graphical 3.5-inch backlit display (396 x 162 pixels)