Agreed with Bert on all points.
You can by the 1-Line Mainpine RF5118 for $400 (http://www.provantage.com/mainpine-rf5118~7MNPN001.htm?source=googleps)
To take full advantage you will want a server OS as Bert mentioned. You can control access and whatnot which I think is something you need to take into account with HIPAA/Meaningful Use. You can have Fax Users/Admins/etc.
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