I have many IP cams that has built in FTP (snapshot or video clip) on event functionality. I would like to build a central monitoring station that receives all the FTP video clips and or snapshots. It should have alarm lists and and when selecting an event it should show the image and then it should have a option to connect live via RTSP to the camera. Also two way audio should be possible on the live video window. These are the basics. What operating system and software would you suggest to build such a system with. To whoever responds thank you in advance.