Question: What information does the AMF provide to the UDM/HSS when queried for T-ADS related information?
Option 1: The AMF provides only the current Access Type and RAT type.
Option 2: The AMF provides whether or not IMS voice over PS Session is supported in the registration area(s) where the UE is currently registered, and the time of the last radio contact with the UE.
Option 3: The AMF provides whether or not IMS voice over PS Session is supported in the registration area(s) where the UE is currently registered, whether or not IMS voice over PS Session Supported Indication over non-3GPP access is supported in the WLAN where the UE is currently registered, the time of the last radio contact with the UE, and the current Access Type and RAT type.
Option 4: The AMF provides only whether or not IMS voice over PS Session Supported Indication over non-3GPP access is supported in the WLAN where the UE is currently registered.
Explanation: When queried by the UDM/HSS for T-ADS related information, the AMF responds with a set of specific details. These include whether IMS voice over PS Session is supported in the current registration area(s), whether IMS voice over PS Session Supported Indication over non-3GPP access is supported in the WLAN where the UE is registered, the time of the last radio contact with the UE, and the current Access Type and RAT type. This comprehensive set of information is crucial for the UDM/HSS to make informed decisions regarding terminating domain selection for IMS voice services.