Research and Application on Businesses Interconnection and Security Technology of New Power IMS Switching Network

China State Grid Company has decided to construct next generation exchanging telecommunication network using IMS technology, and it adopted private digital communication network to overload multimedia services. The users or terminals cannot access the IMS network through internet or other public networks, so that mobile applications cannot be deployed in mobile phones. It analyzed business requirements of power enterprises firstly, brought out implement methods and intercommunication ways between power private network and public network according to power system information security protection requirement, and it gave the comparison and resolution of different methods to use multimedia services for power communication.