Reboot your router.
Wait two minutes.
Reboot your OBi.
(Reboot means remove power, wait 30 seconds, reapply power.)
If still not working.
Attempt a call to the Obi test number.
Attempt a a call to a number on your ITSP.
Point a web browser to the OBi's IP address. (Dial ***1 to hear it if you don't know it.)
Log in. (admin and admin if you have not changed the default password.)
At the left hand side click on the + to the left of Status.
Click on Call History.
Call 1 and Call 2 will show the details of those last two calls.
For the echo test one you should see OBiTALK1, ob222222222 and Outbound in the right hand column.
For the other one you should see equivalent things.
If you do not, what do they say?