The controller is an indispensable device in the integrated video conferencing system, providing full control of all front-end cameras, pan/tilt and motorized lenses. There are usually many numeric keys and function keys on the controller. The numeric keys are used to select the camera or decoder address, and the function keys are used to perform various control operations on the selected front-end device. An LCD liquid crystal display is provided on the control keyboard for displaying control commands or working states of various monitoring programs in the system. One system use one controller for remote control of the entire video conferencing system.