D-Link DFL-1600 User Manual page 191

18.4. H.323
Rules IP Rules
Enter the following:
Name: H323In
Action: Allow
Service: H323-Gatekeeper
Source Interface: any
Destination Interface: core
Source Network: 0.0.0.0/0 (all-nets)
Destination Network: ip-wan (external IP of the firewall)
Comment: Allow incoming communication with the Gatekeeper.
Then click OK
Rules IP Rules
Enter the following:
Name: H323In
Action: Allow
Service: Gatekeeper
Source Interface: LAN
Destination Interface: DMZ
Source Network: lan-net
Destination Network: ip-gatekeeper (IP address of gatekeeper)
Comment: Allow incoming communication with the Gatekeeper.
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 IP Rule:
Add IP Rule:
Note
D-Link Firewalls User's Guide
171