Implementing method for enhancing reliability of session initializing protocol conference system

The invention discloses an implementation method for improving the reliability of a session initiation protocol SIP conference system, which is applied in network structures of peer-to-peer network architectures and client/service nodes, and comprises setting a backup service node in a conference system, starting a switching mechanism when a current service node fails, and supplying service for a current user node which participates in conversation by the backup service node. A C/S mode in a traditional SIP is changed through a P2P under a P2P network structure through the implementation method, the robustness of the system is improved, integral system paralysis can not occur because of the failure of a core node, a backup service node is made for a main service node through a backup mechanism of the service node under a C/S network structure, and the reliability of the system is improved.