Versatile is an operating system, its kernel is written in C with emphasis on speed, low memory footprint and clean code. One of the goal is to have orthogonal persistence and query based file system.
ip-session gets info of network trafic, such as sip, dip, sport, dport, etc. from linux kernel; gets account info of each traffic, such as in/out bytes/pkgs, etc.; else, gives session management function, such as query/del, etc.