VOIP PBX - 3CX

My ISP (Internode) responded to a support ticket I raised today. They offer a VOIP telephone number service. Currently I am signed up and using the service at home. I wanted to be able to test the same service and PBX that I have at home at work. As long as I aren't using the Nodephone service at home I can use it on the business Internode internet connection.

Now to see if I can get the PBX working from behind our Forefront TMG server.