The tests will run a connection between your PC and an internet site to simulate a phone call, but perhaps because you forwarded port 5060 manually in your router to the private IP address of your SPA-3000, it is making it impossible for it to run the test on that port. I've seen that happen but then they tend to run the test on a different port and it works. In general, it is not necessary or even desirable to forward ports in a router to an ATA when setting up the STUN settings correctly will accomplish it. Try to use the STUN settings on this page
http://faq.sipbroker.com/tiki-index....%20or%20Sipura
and then remove manual forwarding and then run the tests again to see what it does. Hope that helps.