Question: What is the primary purpose of the AAA-1 reference point between the SIP database and the SIP core in supporting mission-critical services?
Option 1: To facilitate media transfer for voice communications
Option 2: To manage session setup for video conferencing
Option 3: To handle authentication for user equipment (UE) access
Option 4: To retrieve signalling plane data from the SIP database by the SIP core
Explanation: The AAA-1 reference point is utilized for retrieving signalling plane data, crucial for efficient network operation, enabling the SIP core to access necessary information from the SIP database for effective call setup, management, and teardown, especially in scenarios involving inter-network interfaces.