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Ti+  for  TS 24.228§6.2
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IMS R1 signalling flow - Registration: User not registered - IMS R1-1e. SIP REGISTER request: from I-CSCF1 to S-CSCF1
  • I-CSCF1 does not modify the Path header.
  • P-Access-Network-Info: This header contains information from UE1.
  • Path: S-CSCF1 stores the contents of the Path header and uses the URI for routing mobile terminated requests.