How to allow H323 over ISA 2006 SP1 without any disconnections

I am trying to establish a video conferencing session over H323 protocol over ISA 2006 with SP1. The connection gets established and suddenly disconnects within seconds. Both Audio and Video are available during the connection. How to avoid the sudden disconnection and extend the VC session?

Thanks

Ansar Mohideen
AnsarmohAsked:
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thomaslbergConnect With a Mentor Commented:
That is your issue. I have read all over the web that ISA don't handle double NATing well. Especially for high bandwidth applications.

http://www.experts-exchange.com/Security/Software_Firewalls/Enterprise_Firewalls/Cisco_PIX_Firewall/Q_22765559.html
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thomaslbergCommented:
Create a rule with the following properties.
 
 Action - Allow
 Protocols - H.323 Protocol
 From - External
 To - Internal
 Users - All Users
 
 This rule is a bit to open to use but if you can get a connection with it you should then secure it a bit more by allowing only certain users etc.
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AnsarmohAuthor Commented:
I have done that. bit the sudden disconnection after VC session setup continues.

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AnsarmohAuthor Commented:
The disconnection still there even after creating 3 more rules as per the above link.

Thanks

Ansar
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thomaslbergCommented:
Let me do a little research on this and I will get back later today.
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AnsarmohAuthor Commented:
Fine. Thank you very much for your quick responses and look forward to your reply soon.

Ansar
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thomaslbergCommented:
I have checked with all the people I know and no one seems to have an answer for this.

Are their any other devices in the chain? Router, Firewall, etc?
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AnsarmohAuthor Commented:
I am doing a double NATing. first ISA 2006 then PIX 515. I connected behind pix. it is working fine.
when I connect behind ISA the disconnection is happening
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