Brother MFC-8820DN - Manual (Page 296)

17 - 22 USING BROTHER PC-FAX SOFTWARE
5
The Fax Configuration Wizard starts. Click Next.
6
Enter the sender information, and then click Next.
7
Select Brother MFC-8420 or MFC-8820D in the Please select
the fax device pull-down list. Click to select the Enable
Receive check box. Specify the number of rings before your
MFC will attempt to answer the fax. Click Next.