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Telephone Line Interference/VoIP
Related Models: MFC-J985DW
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.
1. Press [Settings] > [All Settings] > [Initial Setup] > [Compatibility].
2. Press [Normal] or [Basic(for VoIP)].
• [Basic(for VoIP)] reduces the modem speed to 9,600 bps and turns off colour fax receiving and
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.
Related Information
• Telephone and Fax problems
• Voice Over Internet Protocol (VoIP/Telephone Line Interference)
• Error and Maintenance Messages
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