MFC-7840W FAQs & Troubleshooting MFC-7840W Not your product? Sort by: Updated Date Popularity 3 Results 1. 30/01/2014 I'm using Voice Over Internet Protocol (VoIP) and am having problems receiving faxes. 2. 30/01/2014 I am having a problem receiving faxes. 3. 16/03/2012 Why doesn't the machine answer when receiving a call? More FAQs Fax FAQs & Troubleshooting