Found this in the manual you can download from BT :
http://www.bt.com/userguides/downloads/synergy2110.pdf
Synergy 2110 - Edition 5 – 23rd October ’00 (3375)
To switch auto answer on or off
If your handset is on the
base you can answer an
incoming call by simply lifting
the handset and speaking.
However, you can switch
this feature off.
Press the Options button.
Press 0.
PIN Enter the current PIN
(original setting = 0000).
Press the Options button.
Press 5.
Press 1 to switch auto
answer off or press 0 to
switch it on.
Press the Options button to
confirm.
TC, November 2006
