OK, it looks like you need to invest money in an actual pre-built solution. Siremis has nothing to do with the actual functioning of Kamailio. Zero. None. Nada. It just is a nice way to add stuff to the database for you and makes it more friendlier for you. Like when an option in the database is 1 but that really means udp, in Siremis the option just says "UDP".
This sounds like you just need turn-key solution.