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While a Media Gateway Controller (MGC) will use H.248/Megaco to manage media establishment and control with a number of Media Gateways (MG), other VoIP protocol such as SIP and H.323 are used for one Media Gateway Controller (MGC) to communicate with another Media Gateway Controller (MGC).
Other companies like Symbol Technologies, SocketIP, and Digium have implemented this protocol in VoIP Terminals (phones), Media Gateway Controllers, and Softswitches.
Media Gateway Controller talk with each other using SIP, H.323 or ISUP