MFC-4800 FAQs & Troubleshooting MFC-4800 Not your product? Sort by: Updated Date Popularity 4 Results 1. 05/18/2012 Change or delete an existing Speed Dial number. 2. 05/18/2012 Store Speed Dial numbers on my Brother machine for easy dialing. 3. 09/09/2010 Will my Brother machine work with Voice Over Internet Protocol (VoIP)? 4. 07/19/2007 What is Distinctive Ring and how do I program it? Telephone FAQs & Troubleshooting