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I'm interested in Asterisk because it would be cheap to do (I think).

If you have some time to set it up, then Asterisk is awesome. It also offers mind blowing flexibility.

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The lines that come into the building (6 for phone service) are analog POTS. It looks like Asterisk would allow me to load-up a PC with 6 analog modems, but I don't see any examples of this type of set up. What kind of modems would I need?

Yeah, easy. You need either one of these or a couple of these with the appropriate (FXO) modules in them.

I will reply to the rest a bit later... have to go now!
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Hussein