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The signaling protocol used between the G700 Media Gateway and its server is H.248, one of the leading standard protocols for signaling Voice Over IP. The ITU-T/IETF H.248 (MEGACO) Protocol defines communication between a G700 Media Gateway and its server.
A wide variety of protocol choices are available for signaling voice-over-IP, and some are already supported by DEFINITY�, including H.323, and proprietary protocols like CCMS. The G700 uses the H.248 protocol because it is an open standard and allows the G700 to operate with equipment from other vendors adhering to the same protocol.
The G700 is more than an IP to circuit-switched network gateway. It also acts as an announcement server when supported by the Avaya S8700 Media Server, provides general tone detection and generation functions, provides call classification capabilities, and hosts conferences among IP and circuit switched endpoints. All these capabilities require a protocol which is oriented toward IP connection management and IP media handling. VoIP protocols like H.323 are not suited to these tasks: they are oriented toward line or trunk signaling (for example, "setup", "alerting", "connect"). There is no construct in either protocol to use a G700 for the services listed. The natural choice is H.248: it is designed specifically for the capabilities of the G700.
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