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Ti+  for  TS 24.228§7.2.4§7.3.5§7.4.3
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IMS S3 signalling flow - Session Initiation: Origination in CS Network, and Mobile termination in home network - sequence chart for IMS S3-5. SIP UPDATE request (UE1 to UE2)
  • In case the IAM had contained a continuity indication, the COT message arrives to the MGCF.
  • When the resource reservation is completed and the possible COT message is received, MGCF sends the UPDATE request to the terminating endpoint.