QBZappy,
Thanks for the pointer and for doing the search for me (actually I searched, but only on VIP722 and DVR).
The "special" ring on SP2 appeared to have been the culprit. I tried the simple fix of changing the ring, and also switched Callcentric to SP1, but neither of those worked. However, I think some of the fiddling I had done with the Caller ID settings in advanced mode were still interfering, and I wasn't sure they had all been reset correctly.
So, I reset the OBi to defaults using the hardware switch, assigned Callcentric to SP1 and GV to SP2, and now CC Caller ID works correctly on the VIP722.
Thanks again for the help!