Section: 4.7.9.2 Paging for non-GPRS services
Content: The network may initiate the paging procedure for non-GPRS services when the MS is IMSI attached for non-GPRS services. In Iu mode, to initiate the procedure the GMM entity requests the lower layer to start paging (see 3GPP TS 25.331[ None ]  [23c] and 3GPP TS 25.413[ UTRAN Iu interface Radio Access Network Application Part (RANAP) signalling ]  [19c]) for non-GPRS services. In A/Gb mode, to initiate the procedure the GMM entity requests the RR sublayer to start paging (see 3GPP TS 44.018[ None ]  [84] and 3GPP TS 44.060[ None ]  [76] for non-GPRS services). The MS identity used for paging shall be the allocated TMSI if acknowledged by the MS, otherwise the IMSI.