Brother FAX-2440C - Manual (Page 180)

APPENDIX A A - 8
For Fax/Tel mode when power key is On
When the machine is in Fax/Tel mode, it will use the F/T Ring Time
(pseudo/double-ringing) to alert you to pick up a voice call.
If you're at the machine, you can lift the handset or press
Speaker Phone to answer. If you’re at an extension phone, you’ll
need to lift the handset during the F/T Ring Time and then press #51
between the pseudo/double rings. If no one is on the line, or if
someone wants to send you a fax, send the call back to the machine
by pressing
51 .
Fax/Tel mode when power key is Off
You can change the default setting of the On/Off key to
Fax Receive:On so that you can receive faxes when the power
key is off. (See On/Off Setting on page 1-6.) Fax/Tel mode will work
in the following ways.
When the machine is in Fax/Tel mode and pseudo/double-rings to
alert you to pick up a voice call, you can only answer by picking up
the machine’s handset.
If you answer before the machine answers with
pseudo/double-ringing, you can pick up the call at an external or
extension phone.