D-Link DFL-1600 User Manual page 186

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Example:
Using Public IP Addresses
This scenario consists of two H.323 phones, each one connected behind a
D-Link Firewall on a network with public IP addresses. In order to place
calls on these phones over the Internet, the following rules need to be added
to the rule listings in both firewalls. Make sure there are no rules
disallowing or allowing the same kind of ports/traffic before these rules.
Chapter 18. Application Layer Gateway (ALG)
Two Phones Behind Different D-Link Firewalls
Figure 18.4: H.323 Scenario 2.
D-Link Firewalls User's Guide