BenQ M555C - Manual (Page 141)

125 Menus
Keypad tones
Determines whether or not keypad tones are sounded by any key
presses.
Warning tones
Determines whether warning tones will be made to alert you to
various conditions in your phone. (e.g. network registration, battery
low).
DTMF tones
Determines whether DTMF tones are sounded with any key presses
during a call.
Message alert
Determines whether your phone will sound to alert to you an
incoming message.
Answer Mode
Allows you to accept a call either by pressing or by pressing any
key except , which is used to reject a call.
8
There is an auto answer mode available when you change
the answering mode for the Headset profile. If you activate
the auto answer mode your phone will answer an incoming
call after it rings once. This auto answer mode is only
effective when a handsfree headset is connected to your
phone.