Question: Under what conditions will the terminal inform the UICC about an IMS Registration event occurrence using the ENVELOPE (EVENT DOWNLOAD – IMS Registration) command?
Option 1: When the SIP REGISTER message contains any IARI, regardless of the event list setup.
Option 2: When the IMS Registration event is in the current event list and the SIP REGISTER message contains IARIs defined in EF-UICCIARI, upon receiving a 200 OK or failure status code response.
Option 3: Upon every SIP REGISTER message transmission, without considering the event list setup or IARI definitions.
Option 4: Only when the IMS Registration event is not in the current event list but the SIP REGISTER message contains IARIs defined in EF-UICCIARI.
Explanation: This option correctly identifies the specific conditions under which the terminal will inform the UICC about an IMS Registration event. These conditions are two-fold: (1) the IMS Registration event must be part of the current event list, and (2) the SIP REGISTER message must contain the IARIs defined in EF-UICCIARI. The notification to the UICC occurs upon receiving either a successful response (200 OK) or any failure status code in response to the SIP REGISTER message.