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IMS S1 signalling flow - Session Initiation: Mobile origination and termination roaming, with different network operators - IMS S1-5b. SIP UPDATE request (UE1 to UE2): from P-CSCF1 to S-CSCF1
  • P-CSCF1 removes the Security-Verify header and associated "sec-agree" option-tags prior to forwarding the request. As the Require and Proxy-Require headers are empty, it removes these headers completely.
  • P-Charging-Vector: P-CSCF1 adds the GPRS access network information to this header.