Specifications

MultiVOIP Gatekeeper Software Guide 7 Services Window

Exit Zone

When you define a prefix for the Exit Zone service, you need to dial the prefix to

reach an endpoint in another zone. This can be useful for restricting unauthorized

users from making calls to other zones.

When this service is defined, the Gatekeeper only completes calls to other zones if the

Exit Zone prefix is present in the dialed string. After detecting this prefix, the

Gatekeeper strips the prefix before consulting other Gatekeepers to locate the

destination terminal.

Example of using an Exit Zone

In Zone A, the Zone prefix is 1 and the Exit Zone prefix is 0. The phone number of

user A1 is 123 and the phone number of user A2 is 456. The Gateway number is

555444 and the Gateway service prefix is 8.

In Zone B, the Zone prefix is 2. The phone number of user B1 is 123 and the phone

number of user B2 is456. The Gateway service prefix is 9.

• A1 calls A2 at 456.

• A1 calls using Zone A Gateway: 8555444.

• A1 calls B1 at 02123.

• A1 calls using Zone B Gateway: 029555444.

Note: The call is completed only if the Gateway service is allowed as public in Zone B.

Gateway-Supported Prefixes

H.323 Version 2 enables the Gateway to specify prefixes that the user should dial

before the WAN number in order to make a call using a certain medium. For

example, the user could dial the prefix 3 for voice calls or 77 for H.320 video calls. The

prefixes are defined in the RRQ message at registration. The prefix can be any H.323

alias, including an H.323 ID and mail address.

When a terminal places a LAN to WAN call, it should add one of the prefixes to the

dialed number. The Gatekeeper identifies the prefix and routes the call to the

appropriate gateway. If more than one gateway supplies the same prefix, line hunting

is possible between the gateways.