The radio only allows one active phone call at a time. When choosing to initiate or accept a new call, the other existing phone call is dropped.

New incoming call (while call is in progress): The system will prompt to either accept or ignore the new incoming call. If the new call is accepted, the existing call is dropped. If the new call is ignored, the current call continues.

Starting a new call (while call is in progress): Using the keypad, contacts list or emergency phone number, initiate the new call. When prompted, decide whether to continue with the existing call, or to start the new call (terminating the current call).