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After receiving this fax at our business we set it up and received a couple of faxes. Things seemed good to go. Then we started getting calls from people who said that they were trying to send faxes and the line just kept ringing and ringing. We didn't totally believe them so we tested it out. Sure enough - sometimes when we called (from a cell phone) it answered and then other times it didn't. This fax replaced a old fax on a dedicated fax line that has worked perfectly for years, so it wasn't anything in the setup up to the fax machine itself. When you look at the screen when it's not answering it's in "deep sleep" mode. This is apparently different than just regular "sleep mode." So you would think, "I'll just turn off deep sleep mode and that will solve the problem," except that you CAN'T turn off deep sleep mode. It's part of the "ECO" aspect of the fax and it's impossible to shut off in any of the menus. So there you have it: a fax that receives faxes . . . . sometimes. . . . Not a very useful quality in a fax machine. You might think that I just got a lemon but Google this problem and see what you find. I'm not saying it's 100% of the faxes that do this, but clearly the one I got isn't the only one.