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SIP ↠  ExamplesGrammarsPresence ⇾  MainServicesTransactionDialogIMS
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IMS R8 Registration signalling flow - Network initiated re-authentication - sequence chart for IMS R8-1. SIP NOTIFY request
  • This example describes the notification of a UE that occurs when the S-CSCF assigned to that user requests re-authentication.
  • It is assumed that user has registered and also subscribed to the registration state event before.
  • After this procedure the user's UE might automatically initiate re-registration procedures. If the user fails to re-register, the public user identity may be deregistered by S-CSCF.
  • The network initiated re-authentication event for the private user identity of the user occurs at the S-CSCF. As the user has subscribed to the registration state event package this is the trigger point for the S-CSCF to notify the user about the event occurrence. For simplicity, the NOTIFY request towards the P-CSCF is not shown.