Hello, does anyone know how to transfer a caller off site to a cell phone or voicemail system? The system is a NEC Electra Elite. The phone has a Transfer Key, but only works to transfer to internal extensions. Our Carrier has provided the lines with Call Transfer capability, but since the system does not have a Flash Key, we are unable to get an outside line that will allow us to transfer to cell phones. Is this a programmable feature on this phone? Thanks.