Kamailio and Freeswitch Real time Integration with Open Cgrates

We require Kamailio and Freeswitch Real Time integration. Implementation and Architecture should be well documented for us to manage the system. Architecture should include 1. N + 1 instance of Kamailio - Responsible for users registrations and user to user audio/video calls 2. N + 1 instance of Freeswitch server - responsible for voicemail, conferencing, pstn and media 3. Cgrates on Freeswitch for billing 4. Geo-Clustered MySQL DB for Kamailio/Freeswitch 5. DNS/Latency routing for Kamailio FE Please indicate reference jobs of this nature. Also skype to understand exact requirement