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The H.323 standard is a cornerstone technology for the transmission of real-time audio, video, and data communications over packet-based networks. It specifies the components, protocols, and procedures providing multimedia communication over packet-based networks. Packet-based networks include IP-based (including the Internet) or Internet packet exchange (IPX)-based local area networks (LANs), enterprise networks (ENs), metropolitan area networks (MANs), and wide area networks (WANs). H.323 can be applied in a variety of mechanisms: audio only (IP telephony); audio and video (videotelephony); audio and data; and audio, video, and data. H.323 can also be applied to multipoint-multimedia communications. H.323 provides myriad services and therefore can be applied in a wide variety of areas: consumer, business, and entertainment applications. Interworking with Other Multimedia Networks The H.323 standard specifies four kinds of components, which, when networked together, provide the point-to-point and point-to-multipoint multimedia communication services: terminals, gateways, gatekeepers, and multipoint control units (MCUs).
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Terminals Used for real-time bidirectional multimedia communications, an
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H.323 terminal can either be a personal computer (PC) or a stand-alone device running an H.323 and the multimedia applications. It supports audio communications and can optionally support video or data communications. Because the basic service provided by an H.323 terminal is audio communications, an H.323 terminal plays a key role in IP-telephony services. The primary goal of H.323 is to interwork with other multimedia terminals. H.323 terminals are compatible with H.324 terminals on SCN and wireless networks, H.310 terminals on Broadband Integrated Services Digital Network (B-ISDN), H.320 terminals on ISDN, H.321 terminals on B-ISDN, and H.322 terminals on guaranteed QoS LANs. H.323 terminals may be used in multipoint conferences.
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Gateways A gateway connects two dissimilar networks. An H.323 gateway
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provides connectivity between an H.323 network and a non-H.323 network. For example, a gateway can connect and provide communication between an H.323 terminal and TDM networks This connectivity of dissimilar networks is achieved by translating protocols for call setup and release, converting media formats between different networks, and transferring information between the networks connected by the gateway. A gateway is not required, however, for communication between two terminals on an H.323 network.
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4
Gatekeepers A gatekeeper can be considered the brain of the H.323 network. It is the focal point for all calls within the H.323 network. Although they are not required, gatekeepers provide important services such as addressing, authorization, and authentication of terminals and gateways, bandwidth management, accounting, billing, and charging. Gatekeepers may also provide call-routing services. Multipoint Control Units (MCUs) MCUs provide support for conferences of three or more H.323 terminals. All terminals participating in the conference establish a connection with the MCU. The MCU manages conference resources, negotiates between terminals for the purpose of determining the audio or video coder/decoder (codec) to use, and may handle the media stream. The gatekeepers, gateways, and MCUs are logically separate components of the H.323 standard but can be implemented as a single physical device.
H.323 Zone An H.323 zone is a collection of all terminals, gateways, and MCUs managed by a single gatekeeper. A zone includes at least one terminal and may include gateways or MCUs. A zone has only one gatekeeper. A zone may be independent of network topology and may be comprised of multiple network segments that are connected using routers or other devices. Additional protocols specified by H.323 are listed in the following sections. H.323 is independent of the packet network and the transport protocols over which it runs and does not specify them. They are audio codecs; video codecs; H.225 registration, admission, and status (RAS); H.225 call signaling; H.245 control signaling; RTP; and the Real-Time Control Protocol (RTCP).
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