Well forget all that. Due to the complexity of the videoconferencing issue and the way they can interact with routers & such I decided to reduce it to a simpler problem. Hence I set up a box with a web server listening on port 1720. And that is my current test... when we're able to load a
http://dummywebserver.com:1720 from outside the network, then we'll plug in the codec (a Tandberg 3000) and see what's what.