Also, just a shot in the dark, but if the softphone works, and the OBi doesn't, aside from the forehead-slapping obvious (the telephone is on mute or is broken), you may want to try deleting your device from the Obitalk portal, then performing a paper-clip hardware factory reset, and setting it up again with Anveo, to eliminate any residual bogus configuration info from GV.
I'm not an Anveo customer (I use Callcentric and Localphone), but I am sure some Anveo users will pile onto this thread to offer Anveo-specific advice or "hey, that happened to me, too" comments.