MCU Multipoint Control Unit

MCU is an optional component of an H.323enabled network that controls conferences between 3 or more terminals. It consists of:

Although the MCU is a separate logical unit, it may be combined into a terminal, gateway or gatekeeper.

The MCU is required in a centralized multipoint conference where each terminal establishes a point to point connection with the MCU. The MCU determines the capabilities of each terminal and sends each a mixed media stream. In the decentralized model of multipoint conferencing, a MC ensures communication compatibility but the media streams are multicast and the mixing is performed at each terminal.