IMS S4-1c. SIP INVITE request (UE1 to UE2): from S-CSCF1 to BGCF1

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IMS S4 signalling flow - Session Initiation: Mobile origination in home network, Termination in CS network - IMS S4-1c. SIP INVITE request (UE1 to UE2): from S-CSCF1 to BGCF1

P-Charging-Vector: The S-CSCF passes this header to the BGCF for charging.
P-Charging-Function-Addresses: The S-CSCF inserts this header to provide the charging function addresses to the BGCF.