FAX-837MC/FAX-837MCS FAQs & Troubleshooting FAX-837MC/ FAX-837MCS Not your product? Sort by: Updated Date Popularity 2 Results 1. 19/11/2012 I have an external telephone answering device on the same line as my FAX and have the answer mode on my FAX set for TAD mode. How do I know if an incoming call is a telephone (voice) call or a fax? 2. 16/03/2006 Can I reduce the size of a received fax on this machine? Fax FAQs & Troubleshooting