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Ti+  for  TS 24.228§6.3
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IMS R2 signalling flow - Re-Registration: User currently registered - IMS R2-2b. SIP 200 OK response: from I-CSCF1 to P-CSCF1
  • Service-Route: P-CSCF1 saves the value of the Service-Route header and associates it with UE1. P-CSCF1 then forwards 200 (OK) response from I-CSCF1 to UE1 indicating that the registration was successful.