D-Link DFL-1600 User Manual page 199

18.4. H.323
WebUI
:
1. Rules IP Rules
Enter the following:
Name: GWToGK
Action: Allow
Service: H323-Gatekeeper
Source Interface: DMZ
Destination Interface: vpn-hq
Source Network: ip-branchgw
Destination Network: hq-net
Comment: Allow the Gateway to communicate with the Gatekeeper
connected to the Head Office.
Then click OK
There is no need to specify a specific rule for outgoing calls. The D-Link
Firewall monitors the communication between "external" phones and the
Gatekeeper to make sure that it is possible for internal phones to call the
external phones that are registered with the gatekeeper.
Add
Note
D-Link Firewalls User's Guide
IP Rule:
179