back to TS 24.228
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IMS S3 signalling flow - Session Initiation: Origination in CS Network, and Mobile termination in home network - IMS S3-2c. SIP 183 Session Progress response: from S-CSCF2 to I-CSCF1
  • P-Charging-Vector: The S-CSCF adds the identifier of its own network to the terminating Inter Operator Identifier (IOI) parameter of this header and puts back the originating IOI parameter.
  • P-Charging-Function-Addresses: The S-CSCF passes this header to the I-CSCF for charging.