Question: How does an NG-RAN indicate support for eCall over IMS to UEs?
Option 1: By broadcasting an indication of "eCallOverIMS-Support" if the PLMN or all PLMNs in a shared environment support eCall over IMS.
Option 2: By sending a dedicated signal to each UE individually.
Option 3: By modifying the ims-EmergencySupport indicator to include eCall over IMS support.
Option 4: By using a separate broadcast channel for eCall over IMS support indication.
Explanation: The NG-RAN broadcasts an indication of "eCallOverIMS-Support" to indicate its support for eCall over IMS. This allows UEs to determine if eCall over IMS is possible based on this broadcast indicator and their own service state.