NAS Signaling Messages

The NAS signaling layer is used to exchange signaling messages between the UE and the CN.

1. Mobility Management:
LOCATION UPDATE, IMSI DETACH, AUTHENTICATION, TMSI REALLOCATION COMMAND, CM SERVICE, CM RE-ESTABLISHMENT

2. Call Control:
ALERTING, CALL CONFIRM, CALL PROCEEDING, CONNECT, CONNECT ACKNOWLEDGE, SETUP, RELEASE, STATUS

3. GPRS Mobility Management:
ATTACH, DETACH, ROUTING AREA UPDATE, SERVICE REQUEST, P-TMSI REALLOCATION, AUTHENTICATION AND CIPHERING

4. Session Management:
ACTIVATE PDP CONTEXT, DEACTIVATE PDP CONTEXT