Problems of the Kailuan converged communication system were analyzed, double machine cold standby, double machine hot standby, load sharing were studied. the load sharing + cold standby architecture was set up, the signaling and media flow paths were planned, and the underlying scripts of A-SBC, firewall and other devices were written. It extended the flexibility and extensibility of regional user registration and access, improved the rationality and availability of system resource configuration, and the security and reliability of the whole system.