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IPG T-CSCF (Transit Call Session Control Function) is an interworking system between domestic IMS (VoLTE) operators and overseas IMS (VoLTE) operators, and is an international relay call processing system which provides HDVoice call of VoLTE roaming subscribers and overseas/domestic IMS subscribers.
I-CSCF, S-CSCF and BGCF function are provided by integrated in one system.