Question: In a Lawful Interception scenario, when an SDES crypto attribute is present in the SDP for IMS media, what action does the DF2/MF take regarding key processing before forwarding a specific event message to the LEMF over HI2?
Option 1: The DF2/MF generates a new cryptographic key for decryption.
Option 2: The DF2/MF performs additional encryption using the provided SDES crypto attribute.
Option 3: The DF2/MF requests the LEMF to provide a decryption key over HI2.
Option 4: The DF2/MF forwards the event message without additional key processing.
Explanation: According to the specified behavior for Lawful Interception in the context of IMS security, when an SDES crypto attribute is included in the SDP, it implies that the necessary cryptographic key for media decryption is already provided. Therefore, no additional key processing is required by the DF2/MF before forwarding the "start of interception with IMS session" event message to the LEMF over HI2, ensuring a streamlined process for intercepting encrypted media.