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Event ID: 20066 Source: MicrosoftISAFirewall

Registration with the H323 Gatekeeper at address failed. This will prevent inbound calls.
From a newsgroup post: "Disable the H.323 Application Filter if you do not support H.323 through your ISA. It is just noise in the event log at this point. In the ISA MMC, go to Extensions | Application Filters, right click the "H.323 Filter" and select "Disable". It will then give you the choice of restarting the firewall service".

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