User's Manual

Chapter 7 General Tutorials
ISG50 User’s Guide
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Figure 100 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 101 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
ISG50’s 10.0.0.8 WAN IP address to LAN1 IP address 192.168.1.56.
1 Use Configuration > Object > Address > Add to create an address object for the public WAN IP
address (called WAN_IP-for-H323 here). Then use it again to create an address object for the
H.323 device’s private LAN1 IP address (called LAN_H323 here).
10.0.0.8
192.168.1.56
ISG