When set to Auto Answer, the handset accepts an incoming call as soon as you remove it from the charging cradle.
OKTelephonyOKAuto AnswerChange (= activated)
Regardless of the setting Auto Answer, the connection ends as soon as you place the handset back in the charging cradle. Exception: Press and hold for a further 2 seconds while placing the handset in the charging cradle.
OK 
Telephony 
OK 
Auto Answer 
Change (
= activated)
for a further 2 seconds while placing the handset in the charging cradle.