Most people get by with one fax line. You set up the Mainpine to send/receive on the fax line and the fax machine to send only on the same line. Almost every fax machine has that setting that disables receiving. Lots of those scan snaps also have push button faxing. But my point is you can keep both on one line without issues. You can also do as Bert says and keep the walk up fax on a lightly used phone line. Just disable receiving. I don't think you need 2 dedicated fax lines unless you have very high volume.
I do agree that four port is unnecessary. Bear in mind that the 2-Line Model is able to receive 2,000 faxes a DAY. The 4 Line is for 4,000 faxes a DAY. Most practices only need the one line model.
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