Question: What is a key difference between the CSC-12 and CSC-2 reference points in the context of Mission Critical (MC) service application signalling?
Option 1: CSC-12 operates over LTE, while CSC-2 operates over 5G NR.
Option 2: CSC-12 requires SIP-1 and SIP-2 for security, whereas CSC-2 does not.
Option 3: CSC-12 is used for voice services, whereas CSC-2 is used for data services.
Option 4: CSC-12 does not support subscription/notification, unlike CSC-2, which impacts its dependency on SIP-1 and SIP-2 reference points.
Explanation: The correct answer highlights a crucial distinction between the two reference points. CSC-12 is designed for MC service application signalling without the need for subscription or notification services, which in turn means it does not require the use of SIP-1 and SIP-2 reference points, unlike CSC-2. This difference is pivotal for understanding how each reference point supports mission-critical communications, particularly when User Equipment (UE) is off-network, impacting how group management clients and servers interact for configuration purposes.