Brother Copier/Printer MFC-9970CDW - Manual (Page 146)

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Setting Dial Tone detection
B
Setting the Dial Tone to Detection will
shorten the Dial Tone detect pause.
a
Press MENU.
b
Press a or b to display
Initial Setup
.
Press Initial Setup.
c
Press a or b to display Dial Tone.
Press Dial Tone.
d
Press Detection or No Detection.
e
Press Stop/Exit.
Telephone line interference /
VoIP
B
If you are having difficulty sending or
receiving a fax due to possible interference
on the telephone line, we recommend that
you adjust the Equalization for compatibility
to reduce the modem speed for fax
operations.
a
Press MENU.
b
Press a or b to display Fax.
Press Fax.
c
Press a or b to display
Miscellaneous
.
Press Miscellaneous.
d
Press Compatibility.
e
Press Basic(for VoIP), Normal or
High
.

Basic(for VoIP)
reduces the
modem speed to 9600 bps and turns
the error correction mode (ECM) off.
For a standard telephone line: If you
regularly experience interference on
your standard telephone line try this
setting.
If you are using VoIP: VoIP service
providers offer fax support using
various standards. If you regularly
experience fax transmission errors
try this setting.

Normal
sets the modem speed at
14400 bps.

High
sets the modem speed at
33600 bps.
f
Press Stop/Exit.
Note
When you change the Compatibility to
Basic(for VoIP)
, the ECM feature is
only available for color fax sending.