I have a BCM 400 4.0. A user has external call forwarding set up. His desk phone is forwarded to his cell phone. The forwarding works if his extension is dialed from another extension or a call comes into the receptionist and she transfers it to his extension. If the call come into their back door auto attendant line and the caller enters his extension, the caller hears one moment please and then is disconnected. Anyone run into this?