Ok. So when your phone Lights Up, does it show the phone number on the display?
Here is another idea. A real stab in the dark, but how about trying a different tone. Either on the phone itself, or adjust the OBi settings.
The setting for the Ring Tone on the OBi is just above the x_InboundCallRoute. Try setting it to B.
Again, if your phone is lighting up, and if you're getting a number on the display, I'm doubting that it is a problem with the OBi.
Let us know what you do, and hopefully someone else will jump in with an idea.
-G