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VCS Starter Pack With Dual nterface License, H323 video call to outside disconnected after 1min

Hi all.

I have a scenario in a customer with one VCS Starter Pack Express and Dual interface License.

One interface is in same subnet as SX20 and the other have a router 3845 in front with nat for internet calls.

I have a problem when making video calls to outside with H323.

In some cases I have no video in both directions, others I don't have video in one direction and in all cases the call gets disconnected after 1 min.

When I make the call with SIP there's no problem I have video and audio in both directions and the call remains until I disconnect.

Can someone have an idea what can be the problem?

I've attached a draw with scheme.


Paulo Soares