I too am using a Brother fax, similar to Sandeep, but then AT&T came up with a unified messaging system that they converted my voicemail into. It also handles faxes and they are automatically converted to PDF.
While my system seems a little clunky,it is very efficient.
You go to the next message screen click on open the PDF and it opens in adobe acrobat (I have a scan snap which included full Acrobat) I can mark it up there (usually if I want to mark it up I go to paperport, it is easier to mark up there). If it is just a lab, I print it (cute PDF) to a shared folder for my receptionist. While I can extract individual pages in acrobat, it is easier to print the page or 2 pages of labs in cutePDF than use Adobe.
If it is a form that I have signed (in Paperport) I will then print to fax from the Brother and fax it straight out.
I find it interesting that the third party apps like Paperport and CutePDF have found the correct niches that Adobe has left wide open.
While this sounds clunky, it moves quite quickly. I can do about 20 faxes reviewed, signed and put into the correct place in about 15 minutes.
Voice messages are played over the computer and she listens to them with headphones. I can select to only see faxes. The system includes email (I now have another email account) and I can send it from one office to the other easily.
Oh yeah, there is NO additional charge from what I was paying for voicemail (~$8/mo) so can I say it is FREE? (Not quite but next best thing, no more cost)