
Chapter 7 Optional VoIP trunk configurations 133
IP Telephony Configuration Guide
• You can reserve multiple discontinuous ranges. Business Communications Manager requires
that each range meet the following conditions:
— Each range must start with an even number.
— Each range must end with an odd number.
— You cannot have a total of more than 256 ports reserved.
Using a gatekeeper
This section describes the use of a gatekeeper for your H.323 VoIP trunks.
For detailed information about the gatekeepers that the Business Communications Manager
supports, refer to the information under the headings below:
• “Using Radvision ECS 3.2 GK as the gatekeeper” on page 134
• “Using CSE 1000 as a gatekeeper” on page 136
• “Gatekeeper call scenarios” on page 141
The Business Communications Manager supports the use of an ITU-H323 gatekeeper. A
gatekeeper is a third-party software application residing somewhere on the network, which
provides services such as:
• address translation
• call control
• admission control
• bandwidth control
• zone management
• IP registration
A single Gatekeeper manages a set of H.323 endpoints. This unit is called a Gatekeeper Zone. A
zone is a logical relation that can unite components from different networks (LANS). These
Gateway zones, such as the Business Communications Manager, are configured with one or more
alias names that are registered with the gatekeeper. The gatekeeper stores the alias-IP mapping
internally and uses them to provide aliases to IP address translation services. Later, if an endpoint
IP address changes, that endpoint must re-register with the gatekeeper. The endpoint must also
re-register with the gatekeeper during the time to live (TTL) period, if one is specified by the
gatekeeper.
Refer to the gatekeeper software documentation for information about changing IP addresses.
Gatekeeper notes:
• The Business Communications Manager has been tested by Nortel Networks to be compliant
with RADVISION ECS 3.2 GK (http://www.radvision.com/
) and CSE 1000 gatekeeper
applications.
• A gatekeeper may help to simplify IP configuration or the Business Communications Manager
dialing plan, however, it will not simplify the network dialing plan.
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