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The meanings of the "cause" codes are described in the ITU-IT recommendation Q.931.
The value contains two bytes:
The "Diagnostics" field is only present for the following causes (hexa): 5F, 60, 61, 62, 63 and 64.
| Event Code (Hexa) | Byte Value "Cause" (Hexa) | Meaning | Reaction of the Equipment |
|---|---|---|---|
| 60 | 01 | Unallocated number | Call cleared normally |
| 02 | No route to specified transit network | Call cleared normally | |
| 03 | No route to destination | Call cleared normally | |
| 06 | Channel unacceptable | Call cleared normally | |
| 07 | Assigned call putting back to 1 established | Call cleared normally | |
| 10 | Normal clearing | Call cleared normally | |
| 11 | User occupied | Call cleared normally | |
| 12 | User does not respond | Call cleared normally | |
| 13 | Additional service not registered | Call cleared normally | |
| 15 | Call reject | Call cleared normally | |
| 16 | Number changed | Call cleared normally | |
| 18 | Number not assigned | Call cleared normally | |
| 1A | No selected user clearing | Call cleared normally | |
| 1B | Destination not in service | Call cleared normally | |
| 1C | Incomplete address | Call cleared normally | |
| 1D | Facility rejected | Call cleared normally | |
| 1E | Response to STATUS ENQUIRY | Call cleared normally | |
| 1F | Normal unspecified | Call cleared normally | |
| 22 | No circuit or channel available | Call cleared normally | |
| 26 | Network out of order | Call cleared normally | |
| 29 | Network trouble | Call cleared normally | |
| 2A | Network congestion | Call cleared normally | |
| 2C | Requested channel or circuit not available | Call cleared normally | |
| 2F | Network resources temporarily not available | Call cleared normally | |
| 31 | SUU not transmitted (SUU = User to user signalization) | Call is routed | |
| 32 | No authorization for this service | Clear | |
| 39 | Bearer capability not authorized | Clear | |
| 3A | Bearer capability not presently available | Clear | |
| 3B | Call restriction | Clear | |
| 3C | National call transfer rejected | Clear | |
| 3E | No service authorization | Clear | |
| 3F | Service or option not in service, not specified | Clear | |
| 41 | Service support not in service | Clear | |
| 42 | Channel type not put into service | Clear | |
| 45 | Additional service not put into service | Clear | |
| 4F | Service or option not in service, not specified | Clear | |
| 51 | Call reference value not valid | Clear | |
| 52 | Identified channel does not exist | Clear | |
| 53 | Call identity does not exist | Clear | |
| 54 | Call identity in service | Clear | |
| 55 | No call suspended | Clear | |
| 56 | Call having the requested call return entity has been cleared | Clear | |
| 58 | Incompatible destination | Clear | |
| 5B | Invalid transit network selection | Clear | |
| 5C | Additional service parameter erroneous | Call is routed | |
| 5F | Message not valid not specified | Call ir routed | |
| 60 | Obligatory data element not present | Clear | |
| 61 | Unknown message | Message ignored | |
| 62 | Message not compatible with call status | Transmission of a status request message to the network | |
| 63 | Unknown data element or not put into service | The message depends on the received message | |
| 64 | Contents of data element not valid | The message depends on the received message | |
| 65 | Message no compatible with call state | The message depends on the received message | |
| 66 | Recovery on timer expiration | Clear | |
| 67 | Message received with an obligatory "Ei" (Element information) of unknown length | The message depends on the received message | |
| 6F | Not specified protocol error | Clear | |
| 71 | Service support not available | Clear | |
| 72 | End-to-end data transfer not possible | Clear | |
| 7E | Transfer in conversation position | ||
| 7F | Inter-operation not specified | Clear | |
| 80 | N2 cleared (local cause) | Depends on the status of protocol D | |
| 81 | End of time-out (local cause) | Depends on the status of protocol D |
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