Question: What does a `<state>` value of "0" indicate in the `+CAVIMS` parameter command syntax for a User Equipment (UE) in relation to voice calls with IMS?
Option 1: The UE is currently registered for IMS voice services but is unavailable due to network congestion.
Option 2: The UE supports IMS voice calls but has not yet established an IMS connection.
Option 3: The UE's IMS voice call feature is disabled by the user.
Option 4: Voice calls with the IMS are currently not available on the UE.
Explanation: A `<state>` value of "0" explicitly indicates that Voice calls with the IMS are not available. This status informs the Mobile Terminal about the UE's unavailability for voice calls via the IMS network, due to reasons such as lack of IMS registration, insufficient network coverage, or technical issues.