Lexus 2012 RX450h Owner's Manual page 526

3-3. Using the Lexus Display Audio system
Speaking on the phone
The following screen is displayed when speaking on the phone.
■
To adjust the receiver volume
Select "-" or "+". You can also adjust the volume using the steering
switches or the volume knob.
■
To prevent the other party from hearing your voice
Select "Mute".
■ Inputting tones
When using phone services such as an answering service or a bank,
you can store phone numbers and code numbers in the phonebook.
Select "0-9".
STEP 1
STEP 2
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Input the number.