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IPG CSCF (Call Session Control Function) is a core system that controls session based on SIP (Session Initiation Protocol) for wire, wireless and integrated voice of wire-wireless, video and data communication in IMS network.
IPG CSCF consists of three subsystems: P-CSCF(Proxy CSCF), I-CSCF(Interrogating CSCF) and S-CSCF(Serving CSCF).