Sony SPP-A973 - Manual (Page 23)

Notes
• If another call comes in by "call waiting" service while conversing with an
outside caller, you will hear two short beeps.
• Even when you set the RINGER LEVEL switch on the base unit to OFF, the
handset will ring when the ringer of the handset is turned on (see page 28).
Tip
To inform you of an incoming call, the display shows "** RINGING when
ringing.
If you have subscribed to the Caller ID service:
• the caller's number and/or name appears on the display when you receive a
call (see page 43) or when another call comes in by "call waiting" service.
• the ringer sound changes to a higher tone if the call matches the number
stored in the Phone Directory (memory match function; see page 43).
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