Section: 6.4.3.3 NAS integrity failure handling
Content: The supervision of failed NAS integrity checks shall be performed both in the ME and the AMF. In case of failed integrity check (i.e. faulty or missing NAS-MAC) is detected after the start of NAS integrity protection, the concerned message shall be discarded except for some NAS messages specified in TS 24.501[ Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3 ]  [35]. For those exceptions the AMF shall take the actions specified in TS 24.501[ Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3 ]  [35] when receiving a NAS message with faulty or missing NAS-MAC. Discarding NAS messages can happen on the AMF side or on the ME side.