freepbx bulding and adujsting

building and modifying a server based free PBX building a shell for [login to view URL] some more applications making it user friendly to my needs, I already manged to built a free PBX on an online Centos server but I found it to big to start learning who to adjust [login to view URL] be interested to know who much it should cost to build one for my needs,basically it is spoused to be a system that the caller calls and can listen to recorded books and original songs,it needs to have 1 extension in the front that delivers it to many other sub extensions and one voice mail,I read about it a lot at the web found the kamailio project a program that can integrate with the Astrix and free PBX and manage thousands of calls,and also about voice recognition from cmu sphinx. my basic needs are the PBX with extensions voice mail,and a shell to control the wav files from the callers phone,tasks like skipping a few seconds forward and back pause volume control and automatic marking of the last place on the wav file the caller was before he hung-up,I will need to be able to control the uploading of the audio files online with a program like Extplorer ,this is the base,the kamailio part and the cmu sphinx I would be happy to hear who much should it cost but it could be a [login to view URL] another time.