Chapter 1 – Introduction and Description
Multi-Tech Systems, Inc. MultiVOIP Gatekeeper User Guide
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Bandwidth Control
With the Gatekeeper, the network administrator can specify bandwidth limitations within a Gatekeeper’s zone and
can specify a bandwidth limit for gateway endpoints. The Gatekeeper controls bandwidth using H.225 RAS
messages. A Gatekeeper may determine there is no bandwidth available for a call or no additional bandwidth
available for an ongoing call requesting an increase. Dynamic (situation-dependent) changes in bandwidth
allocation are typically called “bandwidth management,” which is considered an optional Gatekeeper function.
Zone Management
The Gatekeeper allows or disallows call traffic within the Gatekeeper’s zone, depending upon established
permissions. The zone might be defined geographically (such as different branch locations), by physical network
connections (a range of IP addresses may comprise a zone, as may a subnet on a particular floor of a building),
or by a functional (organizational) paradigm.
Optional Gatekeeper Functions
The Gatekeeper supports the three main optional Gatekeeper functions: call control signaling, call authorization,
and bandwidth management.
Call Control Signaling
The Gatekeeper can, in “routed” mode, act as an intermediary for H.225 call-control signals between two
endpoints participating in a call. In “direct” mode, this function is turned off and the endpoints exchange H.225
call-control messages directly.
Call Authorization
The Gatekeeper can be programmed to restrict access (admission and registration) according to criteria set by
the user.
Bandwidth Management
This is essentially dynamic bandwidth control (see “Bandwidth Control” section above).
Summary of Contents for MultiVOIP MVP100GK Gatekeeper
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