Developed by the ITU H.323 is a communication control protocol is used to provide multimedia services in the packet switched network. Call control is an important part of it, it can be used to establish media sessions between point-to-point and multi-media conference. H.323 defines the range of circuit-switched networks and packet switching network between H.323 gateways (GateWay), used for address translation and access control gatekeeper (GateKeeper), provides multi-point control of the multipoint controller ( MC), providing mixed multipoint multi-media stream processor (MP), and a multipoint control unit (MCU) and other entities

软交换分组协议基础－－H.323-20021020-B.doc

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