Chapter 5 Managing Traffic
ZyWALL USG 20-2000 User’s Guide
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5.7.2 How to Use an IPPBX on the DMZ
This is an example of making an IPPBX x6004 using SIP in the DMZ zone accessible from the
Internet (the WAN zone). In this example you have public IP address 1.1.1.2 that you will use on
the WAN interface and map to the IPPBX’s private IP address of 192.168.3.9. The local SIP clients
are on the LAN.
Figure 48 IPPBX Example Network Topology
5.7.2.1 Turn On the ALG
Click Configuration > Network > ALG. Select Enable SIP ALG and Enable SIP
Transformations and click Apply.
Figure 49 Configuration > Network > ALG
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