Set Up A Dmz To Lan Firewall Rule For Sip - ZyXEL Communications ZyWALL USG 2000 User Manual

Chapter 7 Tutorials
Click Configuration > Firewall > Add. Set the From field as WAN and the To
1
field as DMZ. Set the Destination to the IPPBX's DMZ IP address object
(DMZ_SIP). IPPBX_DMZ is the destination because the ZyWALL applies NAT to
traffic before applying the firewall rule. Set the Access field to allow and click
OK.
Figure 123 Configuration > Firewall > Add

7.12.5 Set Up a DMZ to LAN Firewall Rule for SIP

The firewall blocks traffic from the DMZ zone to the LAN zone by default so you
need to create a firewall rule to allow the IPPBX to send SIP traffic to the SIP
clients on the LAN.
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ZyWALL USG 2000 User's Guide