Voice over IP project

orkinos used Ask the Experts™
We have ISDN telephone system in my home and  small office with 4 telephones.I search free cost VOIP system to make.
Because I need to pay every new user to connect my ISDN to ISP.
I just need some info ,Is that possible Voip system Free cost make or there is other alternative?
I have 2x windows 2008 server and Linux debian server.
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Asterisk, Trixbox, Freeswitch and other linux based free open source VoIP switch systems are available.

With an ISDN card these systems can integrate VoIP and circuit switched telephony.

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