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Ti+  for  TS 24.228§6.5
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IMS R3 signalling flow - UE subscription for registration state event package - sequence chart for IMS R3-1. SIP SUBSCRIBE request
  • This example describes the subscription procedure for the registration state event, whereby the UE requests to be notified by the S-CSCF when the event has occurred.
  • It is assumed that the user has registered prior to initiating subscription of an event. For this example the trigger point at the P-CSCF for sending out the SUBSCRIBE request is the 200 (OK) response of the user's registration.