Question: Upon receiving a message with a syntactically incorrect mandatory Information Element (IE) over the MME-VLR SGs interface, how should the receiver respond?
Option 1: Ignore the message, send an SGsAP-STATUS message with 'invalid mandatory information' cause, and include the Erroneous message information element.
Option 2: Process the message ignoring the incorrect IE, and send a confirmation without error notification.
Option 3: Reject the message but do not return any error details, to prevent information exposure.
Option 4: Attempt to correct the syntactically incorrect IE before proceeding with message processing.
Explanation: This response is in line with standard error handling practices in telecom protocols, ensuring that erroneous messages are explicitly acknowledged and detailed error information is provided to facilitate debugging and network reliability. By ignoring the faulty message and returning a specific error cause along with the original message, the receiver maintains protocol integrity and assists in troubleshooting.