ZyXEL Communications ZYWALL 1050 Support Notes page 190

application can help enterprise to reduce the operation cost especially saving on long distance
communication fee. The security issues also rise due to the VoIP public network transmission
character. The common VoIP Security issues like call hijacking, identity theft and denial of
service. Thus ZyWALL 1050/ZyWALL USG 300 can protect the VoIP line security by
employing advanced VPN technology.
What's the benefit of using ZyWALL to protect converged network?
‧ Prevent from call hijacking (VoIP over VPN)
‧ Prevent from identity theft (VoIP over VPN)
‧ Mitigate impact of denial of service
We use a simple topology to illustrate and show how ZyWALL 1050/ZyWALL USG 300 can
protect the VoIP line step by step in the following notes.
Main Office
P2002
IP: 192.168.10.37
SIP Number: 850
ZyWALL 1050
WAN: 179.25.3.24
LAN: 192.168.10.0/24
We used two VoIP ATA (ZyXEL P2002 series) connected to office gateway. Each of the VoIP
ATA has a SIP number for remote ATA dialing. This kind of application is called Fix VoIP Line
application. User only needs to install and configure VoIP ATA device and doesn't need to
register with an external SIP server. We will use VPN tunnel for VoIP traffic transmission to
ensure the VoIP security.
VoIP ATA P2002 Configuration:
The default management IP for P2002 is 192.168.5.1. Login to the P2002 GUI and switch to
the Ethernet menu. Set the Ethernet IP setting to "Get IP address Automatically".
All contents copyright (c) 2007 ZyXEL Communications Corporation.
ZyWALL 1050/ZyWALL USG 300 Support Notes
Fix VoIP Line Application
VPN Tunnel
Internet
Branch Office
P2002
IP: 192.168.22.35
SIP Number: 880
ZyWALL70
VPN Tunnel
WAN: 220.123.97.7
LAN: 192.168.22.0/24
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