MCU (Multipoint Control Unit) In H.323-compliant multimedia networks, a device that supports conferencing among three or more participating terminals.The MCU comprises a Multipoint Controller (MC) and optional Multipoint Processors (MPs). The MC is responsible for call control negotiation to achieve common levels of communication.The MP may process either a single media stream or multiple media streams, depending on the nature of the conference. See also H.323 and multimedia. |