Home > Troubleshooting > Telephone and Fax Problems > Set Telephone Line Compatibility for
Interference and VoIP Systems
Set Telephone Line Compatibility for Interference and VoIP Systems
Related Models: MFC-L5700DW/MFC-L5705DW/MFC-L5800DW/MFC-L5850DW/MFC-L5900DW/
MFC-L6700DW/MFC-L6800DW
Problems sending and receiving faxes due to possible interference on the telephone line may be solved by
reducing the modem speed to minimize errors in fax transmission. If you are using a Voice over IP (VoIP)
service, Brother recommends changing the compatibility to Basic (for VoIP).
• VoIP is a type of phone system that uses an Internet connection, rather than a traditional phone line.
• Telephone providers frequently bundle VoIP together with Internet and cable services.
1. Press [Settings] > [All Settings] > [Initial Setup] > [Compatibility].
2. Press the option you want.
• Select [High] to set the modem speed to 33600 bps.
• Select [Normal] to set the modem speed to 14400 bps.
• Select [Basic(for VoIP)] to reduce the modem speed to 9600 bps and turn off Error Correction
Mode (ECM). Unless interference is a recurring problem on your telephone line, you may prefer to use
this option only when needed.
3. Press .
Related Information
• Telephone and Fax Problems
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