November 26, 2005
MEGACO/H.28
The MEGACO/H.28 standard was developed by the IETF and the ITU-T. It is used for facilitating communication between the media gateway and the media gateway controller. It has a distributed gateway architecture and it assumes that the intelligence for processing calls is present in the media gateway controller and that access to the media streams is managed by the media gateway. As against MGCP in which the commands are applicable to the connections, in MEGACO the commands are applicable to the Terminations that are related to a Context.
The Termination, which can also be multimedia, sources and/or sinks either single or multiple media streams. The Add, Subtract, and Modify commands can be used to alter the Contexts. A Connection is required when two or more than two Terminations are placed in a common Context. The MEGACO commands include Add, Modify, Subtract, Move, AuditValue, AuditCapabilities, Notify, and ServiceChange. Unlike MGCP that is defined specifically for UDP/IP transport MEGACO supports UDP/IP, TCP/IP, or ATM.
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