FIAT Panda - Manual (Page 231)

PHONE SET-UP
If a hands-free kit is installed on the car, when there
is an incoming phone call the radio audio will be
connected to the telephone output. The incoming
telephone sound always arrives at a fixed volume, but
it can be adjusted during the conversation using the
ON/OFF button/knob.
The fixed telephone audio volume can be adjusted
using the "SPEECH VOLUME" function in the Menu.
The text “PHONE” appears on the display during the
telephone audio deactivation.
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YSTEM