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Problems > Telephone Line Interference/VoIP
Telephone Line Interference/VoIP
If you are having problems sending or receiving a fax due to possible interference on the telephone line or if you
are using a VoIP system, we recommend changing the modem speed to minimise errors in fax operations.
>> MFC-J4340DW
>> MFC-J4440DW/MFC-J4540DW
MFC-J4340DW
1. Press Settings.
2. Press a or b to make your selections:
a. Select [Initial Setup]. Press OK.
b. Select [Compatibility]. Press OK.
c. Select [Normal] or [Basic(for VoIP)]. Press OK.
• [Basic(for VoIP)] reduces the modem speed to 9,600 bps and turns off colour fax receiving and
Error Correction Mode (ECM), except for colour fax-sending. Unless interference is a recurring
problem on your telephone line, you may prefer to use it only when needed.
To improve compatibility with most VoIP services, Brother recommends changing the compatibility
setting to [Basic(for VoIP)].
• [Normal] sets the modem speed at 14,400 bps.
3. Press Stop/Exit.
• VoIP (Voice over IP) is a type of phone system that uses an Internet connection, rather than a traditional
phone line.
• Brother does not recommend the use of a VoIP line. VoIP limitations in general can cause some
functions of the fax machine not to work correctly.
MFC-J4440DW/MFC-J4540DW
1. Press
[Settings] > [All Settings] > [Initial Setup] > [Compatibility].
2. Press the option you want.
• [Basic(for VoIP)] reduces the modem speed to 9,600 bps and turns off colour fax receiving and
Error Correction Mode (ECM), except for colour fax-sending. Unless interference is a recurring problem
on your telephone line, you may prefer to use it only when needed.
To improve compatibility with most VoIP services, Brother recommends changing the compatibility setting
to [Basic(for VoIP)].
• [Normal] sets the modem speed at 14,400 bps.
3. Press .
• VoIP (Voice over IP) is a type of phone system that uses an Internet connection, rather than a traditional
phone line.
• Brother does not recommend the use of a VoIP line. VoIP limitations in general can cause some
functions of the fax machine not to work correctly.
Related Information
• Telephone and Fax Problems
Related Topics:
• Voice Over Internet Protocol (VoIP/Telephone Line Interference)
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