If the phone attached to the OBi device rings, that means your "incoming" call is calling a 200xxxxxx number, correct? The OBiAPP however is a softclient, but with a different OBi Number starting with 290xxxxxx.
You can check your OBiAPP softclient number by right clicking the OBiAPP icon (Windows system tray), select Properties, and take a look under the MyOBi Tab.
You MUST also configure the X-Lite SIP Accout User-ID to use the same softclient OBi number (290xxxxxx).
But since you can call out, you probably have done that correctly already...
Just note that we cannot ring both your OBi device and the soft client simultaneously, by calling just the OBi device's obi number.