[Serusers] New Bee Information

Hi, I want to use voip for a medium size subscriber, i suggest 10.000 i want to; subscribers talk each other with no charge some one can get 2 or 4 subscribing for faks or something else i want voicemail option for people who can not answer calls maybe conference call Call logs for incoming and outgoing Phonebook maybe first i thougt that ser can do this but i dont know if it can i use suse 9.3 /mysql/php on an intel desktop pc (not a server) with p.4 3ghz 1 Gbit DDR2-533 there are some programs i did not understand their roles; Radius? Asteriks? Sim? Which programs i should use to do them? Please give information, Thanks Toygun