Maybe I'm missing something here, but what you are suggesting here make no sense. PIAF has native GV support, which happens to be a better implementation of GV than the OBi device, so you would simply set up the OBi ATA as an extension on the PIAF, which would provide the CNAM information when the calls are routed to that extension. The PIAF GV implementation allows for incoming calls to ring for more than the allotted 25 seconds native ring time maximum. So you could have an incoming GV call ring for 30, 40, 50, 60, etc. Seconds.
