Question: Upon receiving supplementary service signalling over the A-interface, what action does the MSC/VLR take regarding the version indicator received from the MS?
Option 1: Ignore the version indicator for HLR communication
Option 2: Use the version indicator to set up the right AC context name towards the HLR
Option 3: Send the version indicator to the MS for confirmation before proceeding
Option 4: Use a default AC context name regardless of the version indicator
Explanation: The correct answer is Option 2 because, according to procedures for handling supplementary service signalling, the MSC/VLR utilizes the version indicator provided by the Mobile Station (MS) to establish the appropriate Application Context (AC) context name when communicating with the Home Location Register (HLR), ensuring compatibility and proper handling of the supplementary service request.