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Ti+  for  TS 24.228§6.3
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IMS R2 signalling flow - Re-Registration: User currently registered - sequence chart for IMS R2-1. SIP REGISTER request
  • The HSS information indicates that the subscriber is registered and authenticated, and that the S-CSCF has been allocated to this subscriber.
  • This signalling flow assumes that:
    1. the same PDP Context allocated during the initial registration scenario is still used for reregistration
    2. the DHCP procedure employed for P-CSCF discovery is not needed
    3. the S-CSCF selection procedure invoked by the I-CSCF is not needed.