D-Link DFL-1600 User Manual page 197

18.4. H.323
5. Rules IP Rules
Enter the following:
Name: BranchToGW
Action: Allow
Service: H323-Gatekeeper
Source Interface: vpn-remote
Destination Interface: DMZ
Source Network: remote-net
Destination Network: ip-gatekeeper
Comment: Allow communication with the Gatekeeper on DMZ from the
Remote network
Then click OK
Branch and Remote Office Firewall
The branch and remote office H.323 phones and applications will be
configured to use the H.323 Gatekeeper at the head office. The D-Link
Firewalls in the remote and branch offices should be configured as follows.
The following rule should be in both the Branch and Remote Office
firewalls.
Add
D-Link Firewalls User's Guide
IP Rule:
177