Having the exact same problem.
I will add that I opened the TCP and UDP ports as instructed in the FAQ, tried moving the Obi100 to the DMZ all with no luck.
Also, I tried updating the firmware on the Obi. After, found a setting that told me the attached phone was "on the hook". I tried lifting the phone from the receiver but still got the same message after refreshing.
I have sent in a ticket from the above link.