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ZONE
An H.323 zone is a logical collection of terminals, Gateways and MCUs managed by a single Gatekeeper. A zone must include at least one terminal and may include several LAN segments connected by routers. See also Gatekeeper Zone

ZONE PREFIX
Zone prefixes are similar to telephone area codes. If an endpoint in a zone dials a zone prefix before its number, and the Gatekeeper cannot resolve it in its zone, the Gatekeeper attempts to locate and route the call to the appropriate zone of the Neighbor Gatekeeper.