Patent ID: 7315512

Claim:
A method for implementing signaling link redundancy in IP networks, comprising: the ASPs (Application Server Process) corresponding to the two links are configured in the host at the IP network side, and the said two ASPs establish SCTP (Stream Control Transfer Protocol) association with the SG (Signaling Gateway) respectively after startup; after SCTP association is established successfully, sending ASP startup messages to the UA(User Adaptation) modules of the two ASPs respectively; after receiving the ASP startup ACK message from the SG, the UA module of the primary link sends ASP ACTIVE message, whereas the backup link is inactive without transmission and reception of signaling messages; the UA module of the primary link enters into active state after receiving the ASP ACTIVE ACK, while the UA module of the backup link keeps inactive; when switch is required to initiate, the UA module of the primary link requesting for switch sends a request for “graceful close” the primary link to the SCTP carrier module in the lower layer; “graceful close” the primary link; after the “graceful close” is successful, the UA module of the backup link sends ASP activation message, and the backup link starts data transmission and reception; if said “graceful close” is not successful, mandatory switch will be performed.