Section: 4.5.1.4 Abnormal cases
Content: The behaviour upon abnormal events is described together with the relevant RR procedure or MM common procedure. In addition, the following abnormal events can be identified: a) Indication that a CS fallback to GERAN or UTRAN has failed If EMM indicates that the CS fallback to GERAN or UTRAN failed, the MM sublayer shall abort the paging response procedure. b) Paging message for an MS which is IMSI attached for GPRS and for non-GPRS services in order to obtain GPRS services and "SMS-only service" An MS that received the GPRS-SMS indicator set to "0" at the last combined GPRS attach or combined routing area updating procedure may ignore the paging for CS services. An MS that requested "SMS-only service" in the combined GPRS attach procedure or combined routing area updating procedure may ignore the paging for CS services. NOTE: A network that is compliant with the earlier versions of the protocol will implicitly indicate to the MS that the delivery of SMS via GPRS is always supported, i.e. as GPRS-SMS indicator set to "0", even if it does not provide this support to the MS. The MS can learn whether SMS over GPRS is provided by using the mechanism defined in 3GPP TS 24.011[ Point-to-Point  (PP) Short Message Service (SMS) support on mobile radio interface ]  [22], subclause 2.6. If the MS learns that SMS over GPRS is provided, the MS can ignore paging for CS services.