Brother MFC-8440 B - Manual (Page 126)

7 - 8 AUTO DIAL NUMBERS AND DIALING OPTIONS
Pause
Press Redial/Pause to insert a 3.5-second pause between
numbers. If you are dialing overseas, you can press Redial/Pause
as many times as needed to increase the length of the pause.
Tone or Pulse (Canada only)
If you have a Pulse dialing service, but need to send Tone signals
(for example, for telephone banking), follow the instructions below. If
you have Touch Tone service, you will not need this feature to send
tone signals.
1
Lift the handset of an external phone.
2
Press # on the control panel of your MFC. Any digits dialed after
this will send tone signals.
3
When you hang up, the MFC will return to the Pulse dialing
service.