SIP (session initiation protocol) server state migration sharing method based on business trigger mechanism

The invention discloses an SIP (session initiation protocol) server state migration sharing method based on a business trigger mechanism. A master SIP server takes charge of triggering a message to a spare SIP server; the spare SIP server returns the message back to the master SIP server after carrying out local processing; if the master SIP server is broken down, an SIP terminal transmits the message to the spare SIP server; the spare SIP server is switched into a master SIP server working mode (namely starting a business trigger function). The state migration sharing of the SIP server is achieved by virtue of a core mechanism, namely the business trigger mechanism, of service control of the next generation of network system; meanwhile, modification of an SIP protocol stack, state distinguishing, increase of a private synchronization protocol mechanism, and the like can be avoided. The SIP server state migration sharing method has high realizability, universality and openness, and can be widely applied to achievement of the functions such as hot backup, distributed collaborative call control, distributed collaborative business control and the like of the SIP server.