What is the role of NAS-MM in the control plane between the UE and the AMF?
Handles Registration Management and Connection Management state machines and procedures with the UE
Provides a secure NAS signalling connection between the UE and the AMF
Decides whether to accept the RM/CM part of N1 signalling without considering non NAS-MM messages
Routes NAS messages to other network functions
Transmits other types of NAS messages together with an RM/CM NAS message