Brother DCP-110C - Manual (Page 170)

A - 15 APPENDIX A
Fax/Tel mode in the power save condition
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.
For Fax/Tel mode only
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 press Speaker Phone to answer.
If you lift the external telephone’s handset, press Speaker Phone
twice 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 ( #91 for New Zealand)
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 ( 91 for New Zealand).