If you are sending a fax automatically and the intended recipient's line is busy, your Brother machine will automatically redial that number one time after five minutes.  If the number is still busy when your Brother machine redials it, you must make another attempt to send to it.

If you are manually sending a fax and the intended recipient's line is busy, your Brother machine will not automatically redial the number.  You must press the REDIAL/PAUSE key, then the BLACK (MONO) START or COLOR (COLOUR) START key to redial the number.