User`s guide

Introducing MultiVoice Gateway concepts
What is MultiVoice for the MAX?
MultiVoice Gateway for the MAX— User’s Guide Preliminary November 23, 1998 1-5
• The MultiVoice Gateway goes into a slow poll mode, in which it attempts to register with
the primary Gatekeeper at 30-second intervals, if no valid IP address is configured for the
2nd GK IP parameter.
Reregistration policy
Once the MultiVoice Gateway registers with the secondary Gatekeeper, it periodically attempts
to reregister with the primary Gatekeeper. It makes one attempt after every five successful
registrations with the secondary Gatekeeper. The same registration-failure detection policy
applies. That is, if the MultiVoice Gateway cannot register with the primary Gatekeeper within
five registration attempts, it discontinues the attempts and it maintains registration with the
secondary Gatekeeper.
Note: While attempting to register with the primary Gatekeeper, the MultiVoice Gateway is
effectively unregistered with any Gatekeeper. During this period, new calls are blocked.
However, existing calls continue to operate normally.
Keep-alive registration
Once registered with a Gatekeeper, the MultiVoice Gateway reregisters every 120 seconds.
This is called keep-alive registration. When keep-alive registration fails, the MultiVoice
Gateway attempts to register with the secondary Gatekeeper, provided both a primary and
secondary Gatekeeper are configured. Without a secondary Gatekeeper, the MultiVoice
Gateway goes into a slow poll mode with its current Gatekeeper.
MultiVoice Access Manager uses the registrationDuration parameter to set the
interval when a MultiVoice Gateway registration expires. This parameter defaults to 150
seconds, adding a 30-second buffer to the reregistration interval.
For example, if the MultiVoice Gateway is registered with the secondary Gatekeeper and
keep-alive registration fails, then the Gateway attempts to use the primary Gatekeeper
(assuming the GK IP Adrs parameter is non-null).
MultiVoice network with overlapping coverage areas
In a MultiVoice network with overlapping coverage areas, two or more MultiVoice Gateways
can process in-coming calls to telephone numbers in the same coverage area.
Identical coverage areas may be configured on the Gatekeeper for each MultiVoice Gateway in
the group. This type of network configuration provides for dynamic call management,
allowing the Gatekeeper to perform call load-leveling across a group of MultiVoice Gateways.