MFC-3820CN FAQs & Troubleshooting MFC-3820CN Not your product? Sort by: Updated Date Popularity 3 Results 1. 15/12/2014 I am using Voice Over Internet Protocol (VoIP) and cannot send and/or receive faxes. What can I do? 2. 10/05/2013 Why doesn't the machine answer when receiving a call? 3. 24/05/2006 I cannot receive a color fax. Why? Fax FAQs & Troubleshooting