Linux Phone Server, is this possible?

[CoolTech]

my roomates and I want something that will require a password for each person to make long distance calls, the phone server would then calculate according to phone rates, according to what password made the calls. also, i would like 3 voicemail boxes, with limit on talktime on each, is this possible?

 

[Jzero]

You'd have to be more specific. If you're talking about using it to drive a PBX, then I would say it's possible, but the software might not yet exist.