Section: 5.2.3.2.1 NORMAL-SERVICE
Content: The UE: - shall initiate normal and combined tracking area updating (according to conditions given in clause 5.5.3); - shall perform periodic tracking area updating (see clause 5.5.3) except when attached for emergency bearer services (see clause 5.3.5); - shall initiate a tracking area updating on the expiry of timer T3411; - shall respond to paging; and NOTE: As an implementation option, the MUSIM UE is allowed to not respond to paging based on the information available in the paging message, e.g. voice service indication. - if configured for eCall only mode as specified in 3GPP TS 31.102[ Characteristics of the Universal Subscriber Identity Module (USIM) application ]  [17], shall perform the eCall inactivity procedure at expiry of timer T3444 or T3445 (see clause 5.5.4).