I tried to play with GizmoProject and my Xten EyeBeam softphone using three different networks. None of them could make a call that would terminate. That leads me to believe that there is some type of port blocking or there is a serious NAT issue here.
No one was awake that I could see who I could try a Gizmo to Gizmo call. Of course Skype found a way around the NAT.