MFC-L3770CDW FAQs & Troubleshooting MFC-L3770CDW Not your product? Sort by: Updated Date Popularity 3 Results 1. 29/08/2023 Verify if the Brother machine has a dial tone. 2. 20/02/2019 Combine Address Book Numbers 3. 20/02/2019 Pick up a Voice Call in Fax/Tel Receive Mode Telephone FAQs & Troubleshooting