Before You Begin; The Alg Screen - ZyXEL Communications USG40 User Manual

corresponding policy routes to have calls from LAN IP address A go out through WAN IP address
and calls from LAN IP address B go out through WAN IP address 2.
Figure 281 VoIP with Multiple WAN IP Addresses

15.1.2 Before You Begin

You must also configure the security policy and enable NAT in the ZyWALL/USG to allow sessions
initiated from the WAN.

15.2 The ALG Screen

Click Configuration > Network > ALG to open the ALG screen. Use this screen to turn ALGs off
or on, configure the port numbers to which they apply, and configure SIP ALG time outs.
Note: If the ZyWALL/USG provides an ALG for a service, you must enable the ALG in
order to use the application patrol on that service's traffic.
Chapter 15 ALG
ZyWALL/USG Series User's Guide
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