Sony SPP-A968 - Manual (Page 35)

Answering Machine Features
Answering Machine Features
35 US
Screening incoming calls
You can screen calls by leaving the answering function on (see page
33) while you are at home. When a call is answered, you can hear the
message being recorded through the base unit (you cannot hear the
message through the handset) but the caller cannot hear you. Then,
you can decide whether to answer the call or not. This function is
available only on the base unit.
To answer the call
Press (TALK).
Recording is cancelled and you
can speak to the caller.
Note
If the volume is set to minimum, you cannot screen the calls.
Tip
You can also answer the call by picking up another phone if it is connected to
the same line.