Integrators’ Reference Manual for ViewStation EX, ViewStation FX, and VS4000
60 www.polycom.com
Addressing
The addressing components of an H.323 dial plan are:
❑ Gatekeeper zone identifiers or prefixes
❑ Entity addressing
❑ Terminal aliases (include numeric and alphabetic aliases)
❑ System Services
❑ MCU service prefixes
❑ Gateway service prefixes
Each H.323 entity must have at least one network address (transport
address). The network address uniquely identifies the H.323 entity
on the network. It is typically a TCP/IP address.
If the entity is a terminal, it may also have one or more alias
addresses associated with it.
Zones and Zone Prefixes
A zone is the collection of all terminals, gateways, and MCUs
managed by a single gatekeeper. A zone may be independent of
network topology, and may include multiple network segments
which are connected by routers and other devices.
When using multiple zones (multiple gatekeepers), zone identifiers
must be used. Zone identifiers are analogous to area codes.
Specifying local zone prefixes enables the gatekeeper to resolve
addresses sent by neighbor gatekeepers. The local zone prefix
identifies this gatekeeper. Some gatekeepers do not strip prefixes
before the address when sending out a request for address
resolution. These addresses cannot be resolved without the local
zone prefix. The local zone prefix needs to be removed from the
dialed address in order to match the address to a registrant.
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