I was setting up a new HP OfficeJet Pro 8600 the other day and went to setup the fax, but I couldn't get a dial tone. I realized that this is connected to a Comcast line and their lines are all digital. From what I can tell, the MFP's fax function is supposed to work with analog lines, not digital lines. That surprised me bacause so many users are going to digital lines. So... is there a way to make the fax function work for this printer on a digital line or is there a MFP that has its fax work on a digital line?