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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 S1-8a. SIP PRACK request (UE1 to UE2): from UE1 to P-CSCF1
  • Request-URI: takes the value of the Contact header of the received 180 Ringing response.
  • Security-Verify: contains the security agreement as represented by the received Security-Server header.