Troubleshooting 
91
B
Dial Tone detection B
When you send a fax automatically, by 
default your machine will wait for a fixed 
amount of time before it starts to dial the 
number. By changing the Dial Tone setting to 
Detection, you can make your machine 
dial as soon as it detects a dial tone. This 
setting can save a small amount of time when 
sending a fax to many different numbers. If 
you change the setting and start having 
problems when dialling, you should change it 
back to the No Detection setting.
a Press Menu, 0, 4.
b Press a or b to choose Detection or 
No Detection.
Press OK.
c Press Stop/Exit.
Telephone line 
interference / VoIP B
If you are having problems sending or 
receiving a fax due to possible interference 
on the telephone line or you are using a VoIP 
system, you can change the compatibility 
setting which reduces the modem speed to 
minimise errors.
a Press Menu, 0, 5.
b Press a or b to choose Normal or 
Basic(for VoIP).
Press OK.
 Basic(for VoIP) cuts the 
modem speed to 9,600 bps and 
turns off 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).
 Normal sets the modem speed at 
14,400 bps.
c 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.