Turn On The Alg; Set Up A Nat Policy For H.323 - ZyXEL Communications ZyWALL USG 200 Series User Manual

Chapter 7 Tutorials
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 125 WAN to LAN H.323 Peer-to-peer Calls Example
192.168.1.56

7.11.1 Turn On the ALG

Click Configuration > Network > ALG. Select Enable H.323 ALG and Enable
H.323 transformations and click Apply.
Figure 126 Configuration > Network > ALG

7.11.2 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.
164
10.0.0.8
ZyWALL USG 100/200 Series User's Guide