Question: In Lawful Interception (LI) for IMS media security using MIKEY ticket-based solutions, how are decryption keys and associated information delivered to the Law Enforcement Monitoring Facility (LEMF) when intercepted Communication Content (CC) is encrypted?
Option 1: Embedded within the encrypted CC packet stream over Handover Interface port 3 (HI3)
Option 2: Delivered separately via a dedicated, secure key exchange protocol outside of HI2 and HI3
Option 3: Provided to the LEMF via appropriate Intercept Related Information (IRI) over Handover Interface port 2 (HI2)
Option 4: Not delivered; decryption is expected to occur at the Monitoring Facility using external means
Explanation: According to specifications for Lawful Interception in IMS media security, when MIKEY ticket-based solutions are used and Communication Content (CC) is encrypted, decryption keys and associated information are sent to the LEMF through Intercept Related Information (IRI) over Handover Interface port 2 (HI2), ensuring both encrypted content (via HI3) and decryption means (via HI2) are provided for effective lawful interception.