Patent ID: 8495214

Claim:
A system for call session control function entity disaster tolerance and load balancing, comprising proxy call session control function entities, interrogation call session control function entities, serving call session control function entities, and further comprising a domain name system server, wherein, each proxy call session control function entity or each interrogation call session control function entity is configured to: report its own load equivalent weight to said domain name system server via a DNS UPDATE message; when there is a session initiation protocol register signaling that needs to be out, send a domain name system query signaling to said domain name system server, and route said session initiation protocol register signaling to the call session control function entity corresponding to a service record returned by the domain name system server; each serving call session control function entity is configured to report its own load equivalent weight to said domain name system server via the DNS UPDATE message; and the domain name system server is configured to: offer a proxy call session control function list, an interrogation call session control function list and a serving call session control function list, and adjust a position of each call session control function entity in the corresponding call session control function list according to the received DNS UPDATE message reported by the call session control function entity; and when receiving the domain name system query signaling, return the service record corresponding to the target call session control function entity with minimum load equivalent weight in the corresponding call session control function list to the source call session control function entity.