The following will not work if you have an OBi202. Please ask for additional instructions.
Dial ***1 and note the IP address which will be read out to you.
Put that address into a browser on a computer on the same LAN as the OBi200. Log in with admin and admin, unless you previously changed the password.
Click on Status and then on Call Status. Check that the numbers shown against outgoing calls are as you expect.