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Ti+  for  TS 24.228§7.2.2§7.3.2§7.4.2
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IMS S1 signalling flow - Session Initiation: Mobile origination and termination roaming, with different network operators - IMS S1-2c. SIP 183 Session Progress response: from S-CSCF2 to I-CSCF2
  • P-Asserted-Identity: S-CSCF2 inserts the TEL URI of the user in the P-Asserted-Identity header field.
  • P-Charging-Vector: S-CSCF2 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: S-CSCF2 passes this header to I-CSCF2 for charging.