Trying to block ability to zero out of one NuPoint MB for a customer. I created a phantom w/MB that plays a greeting and hangs up. I set that phantom as the Attendant Extension for user's MB, but pressing zero took me to Primary Attendant. Set Attendant Extension as blank, but pressing zero took me to Primary Attendant. Removed FCOS to tranfer to attendant, but pressing zero took me to Primary Attendant. Is my goal possible?