Brother MFC-8820DN - Manual (Page 278)

17 - 4 USING BROTHER PC-FAX SOFTWARE
Outside line access
If you need to enter a number to access an outside line, enter it here.
This is sometimes required by a local PBX telephone system (for
example, if you must dial 9, to get an outside line in your office).
Include header
To add header information to the top of the fax pages you send,
check the Include header box.
Address Book file
You can select more than one database file to use with the Address
Book. To select you must enter the path and file name of the
database file.
—OR—
Use the Browse button to find the database to select.