Brother MFC-8520DN User Manual page 49

Changing the Remote Codes
The preset Remote Activation Code is l51.
The preset Remote Deactivation Code is #51.
If you are always disconnected when
accessing your External TAD, try changing
the three-digit remote codes, for example ###
and 555.
a
Make sure you are in FAX mode
b
Press Menu, 2, 1, 4.
c
Press a or b to choose On or Off.
Press OK.
d
If you chose On in step c, enter the new
Remote Activation Code.
Press OK.
e
Enter the new Remote Deactivation
Code.
Press OK.
f
Press Stop/Exit.
Telephone and external devices
7
.
7
41