How To Use An Ippbx On The Dmz - ZyXEL Communications USG-300 - V2.20 ED 2 Manual

Chapter 7 Tutorials
Click Configuration > Firewall > Add. Set the From field as WAN and the To
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field as DMZ. Set the Destination to the HTTP server's DMZ IP address object
(DMZ_HTTP). DMZ_HTTP is the destination because the ZyWALL applies NAT to
traffic before applying the firewall rule. Set the Access field to allow and the
Service to HTTP, and click OK.
Figure 134 Configuration > Firewall > Add

7.13 How to Use an IPPBX on the DMZ

This is an example of making an IPPBX x6004 using SIP in the DMZ zone
accessible from the Internet (the WAN zone). In this example you have public IP
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ZyWALL USG 300 User's Guide