Video conferencing from Polycom PVX to Tandberg device

Hi Experts,

I have following scenerio.

Windows XP on which Polycom PVX application installed --> Microsoft ISA 2004 firewall --->Remote Tandberg Device.

I am unable to do video conferenicing over this connection. I have opened the required ports like H.323 and other on my firewall. I feel I am missing some thing here. Could any body provide me the exact resolution to this problem.
I am using H.323 protocol with 256kbps connectivity for video conferencing.

when I tried same scenerio witout firewall ( from public IP) it works fine.

Please provide solutin asap, its urgent.

regards,
Globrin.

GlobrinAsked:
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foobar_666ukConnect With a Mentor Commented:
Microsoft ISA 2004 firewall doesnt really work well with true H323 videoconferencing unfortunately.

ISA 2004 as you are probably aware doesnt support NAT, and this causes a problem.

However ISA can act as a 'H323 Proxy' in that it acts as a 'Gatekeeper' So you register the Polycom PVX software to the Gatekeeper(ISA) and then the ISA proxies the call to the external Tandberg endpoints.

It take a bit of jiggering about and config, but doesn eventually work.

My advice is to use a seperate firewall for your H323 traffic (I reccomend CISCO). ISA is VERY good as an application firewall, but nothing else :)

Good luck & Please ask any further questions.
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foobar_666ukCommented:
A good article that describes it quite well can be found here: http://www.isaserver.org/tutorials/Basic_NetMeeting_and_ISA_Server_H323_Gatekeeper_Configuration.html

I do not have ISA myself, but have had some (bad) experiences of it on other customer sites.

Let us know how you get on!
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