04.083GPPMobile radio interface Layer 3 specificationRelease 1998TS
Cause value = 7 GPRS services not allowed
This cause is sent to the MS if it requests an IMSI attach for GPRS services, but is not allowed to operate GPRS services.
Cause value = 8 GPRS services and non-GPRS services not allowed
This cause is sent to the MS if it requests a combined IMSI attach for GPRS and non-GPRS services, but is not allowed to operate either of them.
Cause value = 9 MS identity cannot be derived by the network
This cause is sent to the MS when the network cannot derive the MS’s identity from the P-TMSI in case of inter-SGSN routing area update.
Cause value = 10 Implicitly detached
This cause is sent to the MS either if the network has implicitly detached the MS, e.g. some while after the Mobile reachable timer has expired, or if the GMM context data related to the subscription dose not exist in the SGSN e.g. because of a SGSN restart.
Cause value = 14 GPRS services not allowed in this PLMN
This cause is sent to the MS which requests GPRS service in a PLMN which does not offer roaming for GPRS services to that MS.
Cause value = 16 MSC temporarily not reachable
This cause is sent to the MS if it requests a combined GPRS attach or routing are updating in a PLMN where the MSC is temporarily not reachable via the GPRS part of the GSM network.
Annex H (informative):
GSM specific cause values for call control