Brother FAX 1840C - Manual (Page 179)

A - 7 APPENDIX A
Advanced receiving operations
Operation from extension telephones
If you answer a fax call on an extension telephone, or an external
telephone in the EXT. jack of the machine, you can make your
machine take the call by using the Fax Receive Code. When you
press the Fax Receive Code
51 , the machine starts to receive a
fax. (See Easy Receive (MFC-3240C and MFC-3340CN only) on
page 4-8 or see Easy Receive (FAX-1840C and FAX-1940CN only)
on page 4-9.)
If the machine answers a voice call and pseudo/double-rings for you
to take over, use the Telephone Answer Code
#51 to take the call at
an extension phone. (See Setting the F/T Ring Time (Fax/Tel mode
only) on page 4-7.)
If you answer a call and no one is on the line, you should assume that
you’re receiving a manual fax.
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Press 51 and wait for the chirp or until the machine’s LCD
displays Receiving , and then hang up.
Your caller will have to press Start to send the fax.