Brother 2850 Owner's Manual page 33

Now, when a call comes in and the machine is set to Fax/Tel (F/T) Mode, all phones on this line will
ring the number of times you selected in Ring Delay.
You can let the machine pick up and detect if it's a fax or voice call. If it's a fax call, the machine
prints the fax. If it's a voice call, the machine signals you with an F/T pseudo-ring for the length of
time you selected in F/T Ring Time.
Even if the caller hangs up during the F/T pseudo-ringing, the machine continues
the F/T pseudo-ringing for the set time.
Fax Detect (set ON by default)
When you use this feature, you don't have to press Fax Start when you answer a fax call and hear
calling beeps. Just hold the handset and wait for several seconds. When you see RECEIVING on
the fax screen or when you hear "chirps" through the handset of an extension phone connected to
another wall socket, just replace the handset, and the machine does the rest. Selecting ON allows the
machine to receive fax calls automatically, even if you lift the handset of an extension or external
phone. Selecting SEMI lets the fax machine receive the call only if you've answered it at the
machine. Selecting OFF means you'll have to activate the machine yourself, by pressing Fax Start
or 5 1 ( 9 1 for New Zealand) if you are not at the machine. (You have to set Remote
Activation to ON in Menu/Set, 2, 1, 4 to use
from an External or Extension Telephone, page 38.)
In case Fax Detect does not work, because of a poor phone line connection, just press the Activation
5 1 ( 9 1 for New Zealand).
Code
1
Press Menu/Set, 2, 1, 3.
2
Use or to select ON, SEMI or OFF and press Menu/Set.
3
Press Stop/Exit.
5 1 ( 9 1 for New Zealand).) (See Operation
22
Receiving a Fax