MFC-640CW FAQs & Troubleshooting MFC-640CW Not your product? Sort by: Updated Date Popularity 2 Results 1. 13/01/2009 What is Distinctive Ring and how do I program it? 2. 27/12/2005 How do I store numbers on my fax machine for easy dialing? (One-Touch, Speed Dial) Telephone FAQs & Troubleshooting