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Hangup the Call
| Cause Value Tag | Cause Value Description |
| ACCESS_INFO_DISCARDED | Access information discarded |
| BAD_INFO_ELEM | Information element nonexistent or not implemented |
| BEAR_CAP_NOT_AVAIL | Bearer channel capability not available |
| CAP_NOT_IMPLEMENTED | Bearer channel capability not implemented |
| CHAN_DOES_NOT_EXIST | Channel does not exist |
| CHAN_NOT_IMPLEMENTED | Channel type not implemented |
| FACILITY_NOT_IMPLEMENT | Requested facility not implemented |
| FACILITY_NOT_SUBSCRIBED | Facility not subscribed |
| FACILITY_REJECTED | Facility rejected |
| GC_CALL_REJECTED | Call was rejected |
| GC_CHANNEL_UNACCEPTABLE | Channel is not acceptable |
| GC_DEST_OUT_OF_ORDER | Destination is out of order |
| GC_NETWORK_CONGESTION | Call dropped due to traffic volume |
| GC_NORMAL_CLEARING | Call dropped under normal conditions |
| GC_REQ_CHANNEL_NOT_AVAIL | Requested channel is not available |
| GC_UNASSIGNED_NUMBER | Requested number is unknown |
| GC_USER_BUSY | End user is busy |
| INCOMING_CALL_BARRED | Incoming call barred |
| INCOMPATIBLE_DEST | Incompatible destination |
| INTERWORKING_UNSPEC | Interworking unspecified |
| INVALID_CALL_REF | Invalid call reference |
| INVALID_ELEM_CONTENTS | Invalid information element |
| INVALID_MSG_UNSPEC | Invalid message, unspecified |
| INVALID_NUMBER_FORMAT | Invalid number format |
| MANDATORY_IE_LEN_ERR | Message received with mandatory information element of incorrect length |
| MANDATORY_IE_MISSING | Mandatory information element missing |
| NETWORK_OUT_OF_ORDER | Network out of order |
| NO_CIRCUIT_AVAILABLE | No circuit available |
| NO_ROUTE | No route. Network has no route to the specified transient network or to the destination |
| NO_USER_RESPONDING | No user responding |
| NONEXISTENT_MSG | Message type nonexistent or not implemented |
| NUMBER_CHANGED | Number changed |
| OUTGOING_CALL_BARRED | Outgoing call barred |
| PRE_EMPTED | Call preempted |
| PROTOCOL_ERROR | Protocol error, unspecified |
| RESP_TO_STAT_ENQ | Response to status inquiry |
| SERVICE_NOT_AVAIL | Service not available |
| TEMPORARY_FAILURE | Temporary failure |
| TIMER_EXPIRY | Recovery on timer expired |
| UNSPECIFIED_CAUSE | Unspecified cause |
| WRONG_MESSAGE | Message type invalid in call state or not implemented |
| WRONG_MSG_FOR_STATE | Message type not compatible with call state |
The full definition of all the various cause codes can be found in
the ITU-T's Q.850 recommendation: http://www.itu.int/rec/T-REC-Q.850/en
ITU-T's Q.931 (ISDN) recommendation itself can be found at: http://www.itu.int/rec/T-REC-Q.931-199805-I/en