FAQs & Troubleshooting

FAQs & Troubleshooting

Set Telephone Line Compatibility for Interference and VoIP Systems

If you are having issues 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 minimize errors in fax operations.

  • VoIP (Voice over IP) 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.
  • (For some countries)
    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.


  1. Press Menu and then select Initial Setup > Compatibility.
  2. Select High, Normal or Basic(for VoIP), and then press OK.
    Option Description
    High Select High to set the modem speed at 33600 bps.
    Normal Select Normal to set the modem speed at 14400 bps.
    Basic(for VoIP) 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 it only when needed.
    To improve compatibility with most VoIP services, Brother recommends changing the compatibility setting to Basic(for VoIP).

  3. Press Stop/Exit.


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Related Models

MFC-B7715DW, MFC-B7810DW, MFC-B7811DW, MFC-L2710DW, MFC-L2713DW, MFC-L2715DW, MFC-L2716DW, MFC-L2800DW, MFC-L2805DW, MFC-L2806DW

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