Sharp FO-10 Operation Manual page 69

Optional A.M. Mode Settings
Quiet Detect Start Time
This setting can be used to delay the start of the Quiet Detect Time
function. For example, if you want to insert a pause at the begining of
your answering machine's outgoing message to ensure clear detection
of fax signals, you can use this setting to delay the start of silence
detection so that the pause will not cause the fax to take over the line.
Quiet Detect Start Timing has been set to 5 seconds at the factory. To
change the setting, follow the steps below.
As general guide, the delay time should be slightly longer than the
pause before the outgoing message.
1
Press these keys:
The display will show:
QUIET START TIME
2
Press a number from 00 to 15.
3
Press the STOP key to return to the
date and time display.
68
FUNCTION
4
0 5
(Example)
STOP