Setup of OpenSIPS server on a Debian 6.0

I would need you to install and configure openSIPS on our Debian 6.0 server running on Amazon EC2. It should be configured so that: traffic from devices behind a symmectrical NAT would have their RTP routed through either a rtpproxy or mediaproxy on that server. You would also need to install the rtp proxy and cofigure it accordingly. Traffic from all other devices should be handled by the nathelper/nat_traversal modules so that we can avoid routing the traffic through our system. Additionally I would like the openSIPS to be able to use an external mySQL DB for providing user credentials. I would need proper documentation of all installation and configuration steps taken. Time is (as usual... ;) ) of the essence so workers being able to start asap will be preferred.