Section: 5.5.3 eCall inactivity procedure
Content: The eCall inactivity procedure is performed only in 3GPP access and applicable only to a UE configured for eCall only mode as specified in 3GPP TS 31.102[ Characteristics of the Universal Subscriber Identity Module (USIM) application ]  [22]. The procedure shall be started when: a) the UE is in any 5GMM-REGISTERED substate except substates 5GMM-REGISTERED.PLMN-SEARCH or 5GMM-REGISTERED.NO-CELL-AVAILABLE; b) the UE is in 5GMM-IDLE mode or 5GMM-CONNECTED mode with RRC inactive indication; and c) one of the following conditions applies: 1) timer T3444 expires or is found to have already expired and timer T3445 is not running; 2) timer T3445 expires or is found to have already expired and timer T3444 is not running; or 3) timers T3444 and T3445 expire or are found to have already expired. The UE shall then perform the following actions: a) stop other running timers (e.g. T3511, T3512); b) if the UE is currently registered to the network for 5GS services, perform a de-registration procedure; c) delete any 5G-GUTI, TAI list, last visited registered TAI, list of equivalent PLMNs, and ngKSI; and d) enter 5GMM-DEREGISTERED.eCALL-INACTIVE state.