Brother MFC-J775DW Online User's Manual page 401

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problems > Set Dial Tone Detection
Set Dial Tone Detection
Setting the Dial Tone to [Detection] will shorten the Dial Tone detect pause.
1. Press Settings.
2. Press a or b to select the following:
a. Select [Initial Setup]. Press OK.
b. Select [Dial Tone]. Press OK.
c. Select [Detection] or [No Detection]. Press OK.
3. Press Stop/Exit.
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