It is one of the signaling protocol like SS7, SIP, etc.
Megaco(H.248) defines the protocol for Media Gateway Controllers to control Media Gateways for the support of multimedia streams across computer networks. It is typically used to provide Voice over Internet Protocol (VoIP) services (voice and fax) between IP networks and the PSTN, or entirely within IP networks.
Media Gateway :-
A media gateway is any device, such as a circuit switch, IP gateway, or channel bank that converts data from the format required for one type of network to the format required for another.
Megaco/H.248 were introduced to inter-network IP and traditional telephony systems and to provide support for large-scale end-to-end deployments. Hence, It enables traditional telephone networks to transmit voice traffic over IP. While other multimedia over IP protocols, such as Session Initiation Protocol (SIP) and H.323, are based on a peer-to-peer architecture,
It specify a master/slave architecture for decomposed gateways. In the master/slave architecture, MGC is the master server and MGs are the slave clients that behave as simple switches.
One MGC can serve multiple MGs.
MGC or “softswitch” is the foundation for next-generation networks offering the intelligence and reliability of the circuit-switched network with the speed and economy of the packet-switched network. MG is the gateway that allows communication between two different networks, e.g., IP and public switched telephone network.
MGs can communicate via a real-time transport protocol (RTP) that provides end-to-end transport functions suitable for applications transmitting real-time data such as interactive audio and video.
RTP service is further augmented by real-time control protocol (RTCP) to allow monitoring the data delivery.
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