Section: 5.5.2 Signalling data integrity
Content: The AMF shall support integrity protection and replay protection of NAS-signalling. The AMF shall support the following integrity protection algorithms: - NIA-0, 128-NIA1, 128-NIA2 as defined in Annex D of the present document. The AMF may support the following integrity protection algorithm: - 128-NIA3 as defined in Annex D of the present document. NIA0 shall be disabled in AMF in the deployments where support of unauthenticated emergency session is not a regulatory requirement. All NAS signalling messages except those explicitly listed in TS 24.501[ Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3 ]  [35] as exceptions shall be integrity-protected with an algorithm different to NIA-0 except for emergency calls.