User's Manual

Chapter 20 ALG
ISG50 User’s Guide
337
address B to receive calls through public WAN IP address 2. You configure corresponding policy
routes to have calls from LAN IP address A go out through WAN IP address
1 and calls from LAN IP
address B go out through WAN IP address 2.
Figure 223 VoIP with Multiple WAN IP Addresses
Finding Out More
•See Section 6.6.11 on page 101 for related information on these screens.
•See Section 7.9 on page 125 for a tutorial showing how to use the ALG for peer-to-peer H.323
traffic.
•See Section 20.3 on page 339 for ALG background/technical information.
20.1.3 Before You Begin
You must also configure the firewall and enable NAT in the ISG50 to allow sessions initiated from
the WAN.
ISG