Not possible to dial from the carkit, due to the HEADSET Profile of the dongle.
Dual call:
A 'beep' is played for the second incoming call.
Hang up the first call with the red button; then the car kit ring, and pick up the green button to take the active conversation.
You can also manage the two calls from your phone, and switch between the calls.
Private mode:
During the conversation, press the control key on the dongle to toggle between handsfree and private mode. Private mode routes the conversation through the phone.
