Draytek VigorIPPBX 3510 User Manual page 117

Enable
Private IP
Choose PC
Check to enable the DMZ Host function.
Enter the private IP address of the DMZ host, or click Choose PC
to select one.
Click this button and then a window will automatically pop up, as
depicted below. The window consists of a list of private IP
addresses of all hosts in your LAN network. Select one private IP
address in the list to be the DMZ host.
When you have selected one private IP from the above dialog, the
IP address will be shown on the following screen. Click OK to
save the setting.
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VigorIPPBX 3510 Series User's Guide