The gateway serves as the interface between the H.323 and non-H.323 network. On one side, it connects to the traditional voice world, and on 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 Shelbyville dial up isp, Shelbyville, NC up isp dial ShelbyvilleShelbyville up isp, dial North Carolina, Shelbyville dial up isp
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