another side to packet-based devices. The gatekeeper is not a required device in an H.323 network, but if present, it must perform a set of functions. Gatekeepers provide address translation (routing) for devices in their zone. This could be, for instance, the translation between internal and external numbering systems. Another important function for gatekeepers is providing admission control, specifying what devices can call what numbers. MCU's allow for conferencing functions between Baltimore business isp, Baltimore, OH isp business BaltimoreBaltimore isp, business Ohio, Baltimore business isp
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