FAX-2480C FAQs & Troubleshooting FAX-2480C Not your product? Sort by: Updated Date Popularity 2 Results 1. 05/15/2013 I am using Voice Over Internet Protocol (VoIP) and I'm having problems sending faxes. 2. 04/25/2013 I am experiencing problems sending a fax. Fax FAQs & Troubleshooting