Section: 5.4.3.4 NAS security mode control completion by the network
Content: The MME shall, upon receipt of the SECURITY MODE COMPLETE message, stop timer T3460. From this time onward the MME shall integrity protect and encipher all signalling messages with the selected NAS integrity and ciphering algorithms. If the SECURITY MODE COMPLETE message contains a Replayed NAS container message IE with an ATTACH REQUEST or TRACKING AREA UPDATE REQUEST message, the MME shall complete the ongoing attach or tracking area updating procedure by considering the ATTACH REQUEST or TRACKING AREA UPDATE REQUEST message contained in the Replayed NAS message container IE as the message that triggered the procedure.