Afraid not. Phone connectivity for calls is always via bluetooth, regardless of whether the phone is connected to the AMI - that's only for media.
Audi used to offer cradles which made a physical connection to the handset for calls but the only real advantage of this was using the sharkfin aerial for better reception. You could still use bluetooth if you preferred and it would switch between the two automatically.
They started to go away from this as providing cradles for new phones became a nightmare. Even the iPhone cradles they provided towards the end warned that they simply provided power and all connectivity was now via bluetooth. Now the cradles have gone altogether.
Now that the phone cradles have been done away with, the Audi phone box preparation gives improved reception quality due to an integrated coupling aerial in the storage compartment.