> 3.4.7 | GSM release cause for L3 Call Control (CC)

> Number | Description
> Normal class
> 1 | Unassigned (unallocated) number
> 3 | No route to destination
> 6 | Channel unacceptable
> 8 | Operator determined barring
> 16 | Normal call clearing
> 17 | User busy
> 18 | No user responding
> 19 | User alerting, no answer
> 21 | Call rejected
> 22 | Number changed
> 25 | Pre-emption
> 26 | Non-selected user clearing
> 27 | Destination out of order
> 28 | Invalid number format (incomplete number)
> 29 | Facility rejected
> 30 | Response to STATUS ENQUIRY
> 31 | Normal, unspecified
> Resource unavailable class
> 34 | No circuit/channel available
> 38 | Network out of order
> 41 | Temporary failure
> 42 | Switching equipment congestion
> 43 | Access information discarded
> 44 | Requested circuit/channel not available
> 47 | Resource unavailable, unspecified
> Service or option not available class
> 49 | Quality of service unavailable
> 50 | Requested facility not subscribed
> 55 | Incoming calls barred within the CUG
> 57 | Bearer capability not authorized
> 58 | Bearer capability not presently available
> 63 | Service or option not available, unspecified
> Service or option not implemented
> 65 | Bearer service not implemented
> 68 | ACM equal or greater than ACMmax
> 69 | Requested facility not implemented
> 70 | Only restricted digital information bearer capability is available
> 79 | service or option not implemented, unspecified
> Invalid message (e.g. parameter out of range) class
> 81 | Invalid transaction identifier value
> 87 | User not member of CUG
> 88 | Incompatible destination
> 91 | Invalid transit network selection
> 95 | Semantically incorrect message
> Protocol error (e.g. unknown message) class
> 96 | Invalid mandatory information
> 97 | Message type non-existant or not implemented
> 98 | Message type not comaptible with protocol state
> 99 | Information element non-existent or not implemented
> 100 | Conditional information element error
> 101 | Message not compatible with protocol
> 102 | Recovery on timer expiry
> 111 | Protocol error, unspecified
> Interworking class
> 127 | Interworking, unspecified