IMS S4-5c. SIP UPDATE request (UE1 to UE2): from S-CSCF1 to MGCF1

back to TS 24.228

IMS S4 signalling flow - Session Initiation: Mobile origination in home network, Termination in CS network - IMS S4-5c. SIP UPDATE request (UE1 to UE2): from S-CSCF1 to MGCF1

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