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IMS S1 signalling flow - Session Initiation: Mobile origination and termination roaming, with different network operators - IMS S1-5c. SIP UPDATE request (UE1 to UE2): from S-CSCF1 to S-CSCF2
  • P-Charging-Vector: S-CSCF1 removes the GPRS access network information to this header and stores it.