MFC-J6720DW FAQs & Troubleshooting MFC-J6720DW Not your product? Sort by: Updated Date Popularity 2 Results 1. 09/19/2014 Why doesn't my Brother machine have a dial tone? 2. 05/26/2014 My brother machine will not stop ringing when it is not in use. Telephone FAQs & Troubleshooting