Question: In a Lawful Interception (LI) scenario for Voice over IP (VoIP) communications, as per 3GPP security standards, what is the primary purpose of using the VoIP-Correlation Number within the VoIP-LIC-header in the Law Enforcement Monitoring Facility (LEMF)?
Option 1: To encrypt VoIP packets for secure transmission
Option 2: To prioritize intercepted VoIP traffic over other types of intercepted data
Option 3: To correlate Communication Content (CC) with Identifying Information (IRI) in the LEMF
Option 4: To facilitate the use of IPsec for non-VoIP packet delivery
Explanation: The VoIP-Correlation Number is utilized within the VoIP-LIC-header specifically to enable the Law Enforcement Monitoring Facility (LEMF) to establish a link between the Communication Content (CC, i.e., the actual voice communication) and the Identifying Information (IRI, e.g., caller and callee IDs). This correlation is crucial for meaningful interception and analysis of VoIP communications.