Linux Telephone Systems?

[Kurth Bemis]

We're looking into phone system options, and natrually, I thought that a
Linux based server whould work nicely.

Basically, any research that I've looked for dosen't turn out to be
anything that i can use.

I'd like to know if the following is possible, and if so what hardware I
would need to interface to my telephones.

I'd like to have the ability to have the incoming calls use callerid data
to display customers information when they call.  Just a webpage that gets
updated ever 3 mins or somthing, depending on call volume.

Then I got to thinking some more. (This is most always a bad thing)

Could the linux box also serve voice mailboxes?
What about call statistics?  Call time, call duration, and call end?
Automation? So that a client can report a "Network Down" and the box will
send an SMS page to several pagers?
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