D-Link DFL-1600 User Manual page 182

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Example:
Using Public IP Addresses
In the first scenario a H.323 phone is connected to a D-Link Firewall on a
network (lan-net) with public IP addresses. To make it possible to place a
call from this phone to another H.323 phone on the Internet, and to allow
H.323 phones on the Internet to call this phone, we need to configure
firewall rules.
The following rules need to be added to the rule listings in the firewall,
make sure there are no rules disallowing or allowing the same kind of
ports/traffic before these rules.
Chapter 18. Application Layer Gateway (ALG)
Protecting a Phone Behind a D-Link Firewall
Figure 18.3: H.323 Scenario 1.
D-Link Firewalls User's Guide