ZyXEL Communications ZYWALL USG 20 - Turn on the ALG; Set up a NAT Policy for H.323

Chapter 7 Tutorials
ZyWALL USG 20/20W User’s Guide
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for wan1 IP address 10.0.0.8 to a H.323 device located on the LAN and using IP
address 192.168.1.56.
Figure 86 WAN to LAN H.323 Peer-to-peer Calls Example
7.9.1 Turn On the ALG
Click Configuration > Network > ALG. Select Enable H.323 ALG and Enable
H.323 transformations and click Apply.
Figure 87 Configuration > Network > ALG
7.9.2 Set Up a NAT Policy For H.323
In this example, you need a NAT policy to forward H.323 (TCP port 1720) traffic
received on the ZyWALL’s 10.0.0.8 WAN IP address to LAN1 IP address
192.168.1.56.
10.0.0.8
192.168.1.56