Home > Troubleshooting > If You Are Having Difficulty with Your Machine > Telephone and Fax 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
- Press Settings.
- Press
or 
to make your selections: - Select [Initial Setup]. Press OK.
- Select [Compatibility]. Press OK.
- 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.
- Press Stop/Exit.
- VoIP (Voice over IP) is a type of phone system that uses an Internet connection, rather than a traditional phone line.
MFC-J4440DW/MFC-J4540DW
- Press
. - 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.
- Press
. - VoIP (Voice over IP) is a type of phone system that uses an Internet connection, rather than a traditional phone line.