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Ti+  for  TS 24.228§7.2.3§7.3.5§7.4.3
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IMS S2 signalling flow - Session Initiation: mobile origination and termination in home network - IMS S2-3b. SIP PRACK 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 Proxy-Require header is empty, it removes this header completely.