D-Link DFL-1600 User Manual page 184

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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. As we are using private IPs on the phone
incoming traffic need to be SATed as in the example below. The object
ip-phone below should be the internal IP of the H.323 phone.
WebUI
:
1. Outgoing Rule
Rules IP Rules
Enter the following:
Name: H323Out
Action: NAT
Service: H323
Source Interface: LAN
Destination Interface: any
Source Network: lan-net
Destination Network: 0.0.0.0/0 (all-nets)
Comment: Allow outgoing calls.
Then click OK
Chapter 18. Application Layer Gateway (ALG)
Add IP Rule:
D-Link Firewalls User's Guide