Question: In Mission Critical services over a 5G System, which plane is responsible for providing necessary signalling support to establish associations of users involved in an MC service, such as an MCPTT call?
Option 1: Application Plane (e.g., for media conferencing, tone provisioning)
Option 2: Session Connectivity Plane (for managing user sessions across the network)
Option 3: Resource Control Plane (for policy and charging control of MC services)
Option 4: Signalling Control Plane (for establishing user associations in MC services)
Explanation: The correct answer is the Signalling Control Plane because it specifically provides the necessary signalling support for establishing associations among users involved in MC services (e.g., an MCPTT call), crucial for initiating and managing connectivity between participants.