Sharp FO-1650 Operation Manual page 66

REMOTE OPERATIONS
Recording a "Memo"
You can leave a "memo" for yourself or other users of the machine. It will be
recorded in the General Box, and played back when messages in that box are
listened to.
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4-12 USING THE ANSWERING MACHINE
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Press "*" and " " on the telephone.
When you hear a short beep, speak into
the telephone to record the memo.
When you are finished, press "
If the FO-1650/1850 detects a certain
period of silence, it will stop recording
automatically.
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" and " ".