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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 R2-2. SIP 200 OK response
Update registration timer: As the REGISTER request arrived integrity protected, S-CSCF1 does not need to challenge the user, but just update the registration timer to the value requested by the user (if the policy of the network allows it).

NOTE: S-CSCF1 is allowed to challenge the user. If S-CSCF1 decides to challenge the user, the call flow will be similar to the one presented in "Registration: user not registered".