> 3.4.5 | GSM release cause for Mobility Management (MM) or Session Management (SM)

> Number | Description
> Causes related to MS identification
> 2 | IMSI unknown in HLR
> 3 | Illegal MS
> 4 | IMSI unknown in VLR
> 5 | IMEI not accepted
> 6 | Illegal ME
> Cause related to subscription options
> 11 | PLMN not allowed
> 12 | Location Area not allowed
> 13 | Roaming not allowed in this location area
> Causes related to PLMN specific network failures and congestion
> 17 | Network failure
> 22 | Congestion
> Causes related to nature of request
> 25 | PDP context is deactivated because of a LLC or SNDCP failure
> 32 | Service option not supported
> 33 | Requested service option not subscribed
> 34 | Service option temporarily out of order
> 38 | Call cannot be identified
> Causes related to invalid messages
> 95 | Semantically incorrect message
> 96 | Invalid mandatory information
> 97 | Message type non-existent or not implemented
> 98 | Message not compatible with protocol state
> 99 | Information element non-existent or not implemented
> 100 | Conditional information element error
> 101 | Messages not compatible with protocol state
> 111 | Protocol error, unspecified
> Causes related to GPRS
> 7 | GPRS services not allowed
> 8 | GPRS services not allowed in combination with non-GPRS services
> 9 | MS identity cannot be identified by the network
> 10 | Implicitly detached
> 14 | GPRS services not allowed in current PLMN
> 16 | MSC temporarily unreachable