calling card, ipbx, ip centrex, voip solution to implement through a softswitch to build and install by faslove

Hello In order to start a voip business, I would like to build a softswitch (dedicated server) to provide following services: – Calling cards – Ipbx – call back (pin/pinless) – IP Centrex Different… (Budget: $30-$250 USD, Jobs: Asterisk PBX, Linux, MySQL, PHP, Smarty PHP)