Sony SPP-A968 Operating Instructions Manual page 20

Receiving calls (continued)
To turn the ringer off
Set the RING switch on the bottom to OFF.
You can save battery power.
The handset will not ring. You can still make calls, and
also receive calls if another telephone connected to the
same line rings to inform you on incoming calls, but you
cannot page the handset from the base unit.
RING switch
Note
You cannot receive Caller ID data when the handset is off
and the base unit in RING OFF mode. See page 39 for
details.
20 US
Basics