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Chapter 3 – Gatekeeper Functionality
VOIP Network Example
The present example shows a voip network with three gateways, and a Gatekeeper directing voip traffic. The
network design gives phone users at each office toll-free access to both the company employee phones (most are
on PBXs) at the remote sites as well as the local PSTNs surrounding the remote sites. To implement this network
you should configure the voip gateways at the three sites and then configure the Gatekeeper.
The top gateway is a T1 digital voip gateway (MVP2410) connected to a PBX at the company’s headquarters in
“Mucksville.” Also, at the company’s headquarters is a Gatekeeper with a separate IP connection to the IP
network for directing the voip traffic. The Gatekeeper should be configured after the voip gateways are
configured. The second gateway, located in one of the company’s small sales offices in “Rootersville,” is a firstgeneration MultiTech gateway with two analog channels (MVP200), one serving an analog phone (via FXS
interface) and the other giving access to its local area PSTN (via FXO interface). The third gateway is an analog
model (MVP410) whose four channels are all connected (via FXO interface) to a PBX at a company’s factory site
in “Compton.”
To implement this network, lets start with the MultiVOIP gateway at the company’s headquarters.
1. MVP2410. For the MVP2410 at the company headquarters in Mucksville, we need to first configure its
phonebook with the Gatekeeper in mind. We will presume here that technical configuration is already
complete so that the MVP2410’s IP address and other technical configuration parameters have already
been duly set.
Mucksville -- company headquarters
9, xxx-xxx-xxxx
Mucksville area
PSTN
PBX
extensions 7000 – 7300
Mucksville -- company
headquarters
GateKeeper
T1
H.323 ID = 79 (access to
Channels 1-24
Mucksville PSTN)
IP = 192.168.80.12
MVP2410 GW Prefix = 7 (access to
Gateway
Rootersville -- sales office
PBX extensions)
IP = 192.168.80.143
IP
NETWORK
IP = 192.168.80.8
Ch1 H.323 ID = 6 (access to
Rootersville PSTN)
MVP200
Ch2 H.323 ID = 6000 (access Gateway
to analog phone)
CH2 CH1
FXO
FXS
6000
analog phone
Rootersville area
PSTN
Compton -- factory
MVP410
Gateway
Channels 1-4
FXO
IP = 192.168.80.9
GW Prefix = 5 (access to
PBX extensions)
H.323 ID = 59 (access to
Compton PSTN)
PBX
Multi-Tech Systems, Inc. MultiVOIP Gatekeeper User Guide
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