Red 5 video only working locally

I have setup a basic Openfire server on a windows box.

I have a client on XP

I have installed the Red5 plugin and then pointed a web client on each machine to

http://server:7070:/red5/video/red5.html

This brings up the test page ok and I click on the 2 way audio/video test.

On each machine the video comes up for the local machines but I cannont get the video from the other machine to come across.

I am only looking at my own camera on each machine.

Is there a setting somewhere I am missing to make this work - I am almost there.

Thanks for any help

Roger