ISA and NetMeeting

Hi all,
I'm trying to use my webcam on my W2k ISA Server (SP2 and all patches) with NetMeeting. When I launch NetMeeting I don't have access to the video options and I don't have any video window.
The webcam works fine with other programs on this server.
ISA port 1720 is opened.
GateKeeper seems to be well configured.
From a client on the lan, I can call external client without problem.
NetMeeting works fine on other W2K server (not ISA).
Is there another port to open ?
Is it possible to have Neetmeeting on ISA server ?
What did I do wrong or what have I forgotten ?
TIA
Franck





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