MFC-3820CN FAQs & Troubleshooting MFC-3820CN Not your product? Sort by: Updated Date Popularity 3 Results 1. 21/12/2012 Why doesn't my Brother machine have a dial tone? 2. 28/09/2009 I can receive a fax, but cannot receive a call. 3. 03/08/2009 Why doesn't the machine answer when receiving a call? More FAQs Telephone FAQs & Troubleshooting