Patent ID: 7936665
Filing Date: 2011-05-03
Classification: H04L,H04M,H04W

Abstract:
1. A subscriber data restoring type IMS (IP Multimedia subsystem) network system comprising: a P-CSCF (Proxy Call Session Control Function) connected to a SIP (Session Initiation Protocol) terminal as a subscriber terminal via an access network; a S-CSCF (Serving Call Session Control Function) located within a service provision area of a provider to which the SIP terminal subscribes; and a HSS (Home Subscriber Server) storing user subscription information, wherein the S-CSCF has the functions of: transmitting a SIP RESET signal to the P-CSCF neighboring thereto when losing subscriber data acquired by registration processing; receiving a SIP REGISTER signal transmitted by the P-CSCF in response to the SIP RESET signal; and performing re-registration processing according to the received SIP REGISTER signal to restore the lost subscriber data from the HSS.