Question: At what point is the user connection attached for a speech call in a mobile terminating scenario?
Option 1: When the mobile station sends the connect message.
Option 2: When the mobile station receives the SETUP message from the network.
Option 3: After the mobile station receives the CONNECT ACKNOWLEDGE message from the network.
Option 4: Before the mobile station sends the ALERTING message.
Explanation: In a speech call scenario, the user connection attachment is required to be completed by the time the connect message is sent. This ensures that the necessary resources are allocated and the call can proceed with the appropriate quality of service for voice communication.