Brother MFC-8440 B - Manual (Page 103)

SETUP SEND 6 - 8
Manual and automatic fax Redial
If you are sending a fax manually and the line is busy, press
Redial/Pause , and then press Start to try again. If you want to
make a second call to the last number dialed, you can save time by
pressing
Redial/Pause and Start .
Redial/Pause only works if you dialed from the control panel.
If you are sending a fax automatically and the line is busy, the MFC
will automatically redial one time after five minutes.