Kamailio database-based routing

I am building cloud PBX platform and need Kamailio behind it. It should accept call invites (both registrations and calls) and forward them to cloud server with following requirements for registration and call-routing: All accounts of single customer must be registered at single server. Calls should be routed to server, based on registration. If that server became unavailable (unresponsive), all SIP registrations must be relocated to another server. Sample: Customer A has accounts sipA-1, sipA-2, desired servers Ast1, Ast3; Customer B has accouns sipB-1, sipB-2, servers: Ast2, Ast3. Sip registrations (and calls) of sipA-1 and sipA-2 first should be forwarded to Ast1, if filed, to Ast3. For customer B it is Ast2, then Ast3. Other conditions: – RTP proxy must be installed (same with Kamailio server) and calls should be routed through. – All types of SIP protocols must be accepted: udp, tcp, tls, ws, wss; – Please include separate routing rules for ws/wss, they may get exceptions in future, i.e. different servers priorities or exceptions regarding RTP proxy; – How I can manually switch customer registrations and calls (can only update DB? Perform some action?) Comments: – Cloud PBX servers will be both Asterisk and Freeswitch; – Configuration should be designed with routing rules(i.e. route[TOSOMEWHERE] { ... } ), and they should be clearly documented (commented) Simple integration article: [login to view URL]:realtime:kamailio-4.0.x-asterisk-11.3.0-astdb, and I want only to add multi-server support. Don't need to integrate Asterisk DB (I have freeswitch too) to Kamailio, it must be different databases, I will sync data. Development workflow: – I will provide pre-configured accounts (4-6 accounts) on different servers and desired (Debian, Ubuntu, Centos) server for kamailio with full root access. – Servers with SIP accounts will get private IP addresses, Kamailio will get both private and public address. – Will release milestone payment (50%) once will be able to test SIP and WebRTC call through Kamailio Budget: – 200$. It is one-day work