Lexus 2003 LS Owner's Manual page 483

Hook Key / End
The hook key's main functions are to place, receive and termi-
nate calls.
will also terminate a call when touched.
Sending Tone Signals
Tone signals can be sent using the keypad of the console display
while making a call. Services such as remote operation of voice
mail and making balance inquiries can be completed by sending
tone signals.
Touch
on the Call screen of the console display.
Shaded text indicates operations that cannot be performed
while vehicle is in motion.
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Section 3
NOTICE