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Hook Comcast VOIP and fax through same phone outlet

I have one phone jack in my office. I want to hook my cable modem and fax machine into the same jack. When I try using a simple 2-way splitter, my digital phone service nor fax work. When I remove the splitter and only plug in my modem, the digital phone service works fine. Why doesn't a 2-way splitter work?
 
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