Hello,
The goal would be to minimize the expenditure on new equipment, and utilize as much of the existing equipment as possible, so I guess it just depends on what the requirements of working with an open source PBX are. The current desktop phones are pretty sophisticated and provide a lot of functionality the preference would be to continue to employ them.
It looks like that at a minimum, you'll need at least one 4-port FXO card (which Digium now sells...for around $350 I think). This would handle the incoming calls.
Most proprierary PBX systems like to use their own phones as well, so in almost all cases they are not going to work w/ anything outside the PBX they were designed for. That's just how it is...and how PBX vendors can lock you into their technology.
You could set the PBX up to pass-through calls on the analog lines with a 4-port FXS card ($305 @ digium)...and extend w/ IP phones as you can move things over.
As far as phones go, you can find Cisco 7960s online for as little at $400 apice...or you can deploy softphones to your desktop computer and use those instead.
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