This is a great guide! You should add one step in beginning to click Receive Coins, then right click an address to set the VoIP address.
I tested port 5060 and it is open, and sent you some test IM did you get them?
If the Detected NAT type says "(n/a no STUN server configured)" does this matter at all?
my test address: KMXVAiWCSUFpzSnqs9uhfSxVdt6GdnMpJ9