Turn On The Alg; Set Up A Nat Policy For H.323 - ZyXEL Communications ZyWall USG 2000 User Manual

for ge2 IP address 10.0.0.8 to a H.323 device located on the LAN and using IP
address 192.168.1.56.
Figure 109 WAN to LAN H.323 Peer-to-peer Calls Example
192.168.1.56

7.10.1 Turn On the ALG

Click Configuration > Network > ALG. Select Enable H.323 ALG and Enable
H.323 transformations and click Apply.
Figure 110 Configuration > Network > ALG

7.10.2 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 LAN IP address
192.168.1.56.
ZyWALL USG 2000 User's Guide
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Chapter 7 Tutorials
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