The problem is not that no phones ring. Your cellphone rings just fine, as you noted. Therefore, since you can make, and receive calls on GV (receiving via the cell), it seems pretty clear the issue is with either a) Google Voice isn't setup properly to forward calls to Talk, which is how your OBi gets them, b) You messed up GV somehow, or c)Your OBi isn't properly setup with your GV account.
I would delete the entire setup in the OBi interface, reset the 202, and start all over.