Oki BV1250, Руководство по установке

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Oki BV1250 Installation Guide PLANNING
Revision 1.0 Page 19 of 334
Gateways
In an H.323 network, an Oki BV1250 IVG unit is classified as a Gateway
device.
Gateways can provide many different kinds of service but almost all
provide translation services that enable end-point terminals of different
types to communicate with one another seamlessly. TCP/IP network
Interfaces are provided for analog telephone and fax, Key Telephone
Systems, PBX, and PSTN networks.
When a BV1250 unit is installed in an H.323 network, the unit is in
continuous communication with the H.323 Gatekeeper and uses the call
addressing and management services provided by the Gatekeeper.
In addition, the BV1250 unit provides the interface between the worlds of
voice and data communications, performing for example, voice
compression/decompression and voice and fax data packetization and
de-packetization.
Terminals
At a minimum, H.323 terminals support voice communications, but may
also support video and data. Three other required components are Q.931 for
call signaling and call setup, Registration/Admissions/Status (RAS), which
is used for Gatekeeper and Gateway communications, and support for
RTP/RTCP sequencing of audio and video packet data. These requirements
apply to all H.323 devices.
Although the BV1250 is capable of communicating with other H.323
compliant devices, the current implementation is intended to communicate
with PSTN terminal devices such as; analog telephones, PBXs, Key
Telephone Systems, and other telephone networking devices.
Multipoint Controllers
Multipoint Controllers manage the process by which calls involving three
or more terminals are setup and managed. The capabilities may be
implemented in stand-alone equipment or may be integrated into Gateway
and/or terminal devices.