Set Up A Wan To Dmz Firewall Rule For Sip - ZyXEL Communications USG-300 - V2.20 ED 2 Manual

Chapter 7 Tutorials
• Click OK.
Figure 139 Configuration > Network > NAT > Add

7.13.4 Set Up a WAN to DMZ Firewall Rule for SIP

The firewall blocks traffic from the WAN zone to the DMZ zone by default so you
need to create a firewall rule to allow the public to send SIP traffic to the IPPBX. If
a domain name is registered for IP address 1.1.1.2, users can use it to connect to
for making SIP calls.
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ZyWALL USG 300 User's Guide