FAX-3800 FAQs & Troubleshooting FAX-3800 Not your product? Sort by: Updated Date Popularity 2 Results 1. 05/14/2013 I am experiencing problems sending a fax, what can I do? 2. 10/28/2011 I'm using Voice Over Internet Protocol (VoIP) and am having problems sending faxes. Fax FAQs & Troubleshooting