Turn On The Alg; Set Up A Nat Policy For H.323 - ZyXEL Communications ISG50-ISDN User Manual

Chapter 7 General Tutorials
Figure 100 WAN to LAN H.323 Peer-to-peer Calls Example
192.168.1.56

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.
Use Configuration > Object > Address > Add to create an address object for the public WAN IP
1
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).
126
10.0.0.8
ISG
ISG50 User's Guide