AVer EVC900 - Manual (Page 73)

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H.323 Extension
Enter a numeric value for the gatekeeper to
identify your system further.
Gatekeeper IP Address
Enter the IP address for the gatekeeper server.
Connect to Gatekeeper
Select this check box to Activate/deactivate
gatekeeper.
 Make sure to setup the Gatekeeper before setting up the Firewall.