Section: 5.5.4 eCall inactivity procedure
Content: The eCall inactivity procedure is 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 ]  [17]. The procedure shall be started when: - the UE is in any EMM-REGISTERED substate except substates EMM-REGISTERED.PLMN-SEARCH or EMM-REGISTERED.NO-CELL-AVAILABLE; - the UE is in EMM-IDLE mode; and - 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: - stop other running timers (e.g. T3411, T3412); - if the UE is currently registered to EPS services only, perform a detach procedure for EPS services only; - if the UE is currently registered for both EPS services and non-EPS services, perform a combined detach procedure for EPS services and non-EPS services; - delete any GUTI, TAI list, last visited registered TAI, list of equivalent PLMNs, and eKSI; and - enter EMM-DEREGISTERED.eCALL-INACTIVE state.