| Class | Value | Cause Number |
Cause |
|---|---|---|---|
| 000 | 0001 | 1 | Unallocated (unassigned) number |
| 000 | 0010 | 2 | No route to specified transit network |
| 000 | 0011 | 3 | No route to destination |
| 000 | 0110 | 6 | Channel Unacceptable |
| 000 | 0111 | 7 | Call awarded and being delivered in an established channel |
| 001 | 0000 | 16 | Normal call clearing |
| 001 | 0001 | 17 | User busy |
| 001 | 0010 | 18 | No user responding |
| 001 | 0011 | 19 | No answer from user (user alerted) |
| 001 | 0101 | 21 | Call Rejected |
| 001 | 0110 | 22 | Number changed |
| 001 | 1010 | 26 | Non selected user clearing |
| 001 | 1011 | 27 | Destination out of order |
| 001 | 1100 | 28 | Invalid number format |
| 001 | 1101 | 29 | facility rejected |
| 001 | 1110 | 30 | Response to status enquiry |
| 001 | 1111 | 31 | Normal, unspecified |
| 010 | 0010 | 34 | No circuit/channel available |
| 010 | 0110 | 38 | Network out of order |
| 010 | 1001 | 41 | Temporary failure |
| 010 | 1010 | 42 | Switching equipment congestion |
| 010 | 1011 | 43 | Access information discarded |
| 010 | 1100 | 44 | Requested circuit/channel not available |
| 010 | 1101 | 45 | Pre-empted |
| 010 | 1111 | 47 | Resources unavailable, unspecified |
| 011 | 0001 | 49 | Quality of service unavailable |
| 011 | 0010 | 50 | Requested facility not subscribed |
| 011 | 0100 | 52 | Outgoing calls barred |
| 011 | 0110 | 54 | Incoming calls barred |
| 011 | 1001 | 57 | Bearer capability not authorised |
| 011 | 1010 | 58 | Bearer capability not presently available |
| 011 | 1111 | 63 | Service or option not available, unspecified |
| 100 | 0001 | 65 | Bearer capability not implemented |
| 100 | 0010 | 66 | Channel type not implemented |
| 100 | 0101 | 69 | Requested facility not implemented |
| 100 | 0110 | 70 | Only restricted digital information bearer capability is available |
| 100 | 1111 | 79 | Service or option not implemented, unspecified |
| 101 | 0001 | 81 | Invalid call reference value |
| 101 | 0010 | 82 | Identified channel does not exist |
| 101 | 0011 | 83 | A suspended call exists, but this call identity does not |
| 101 | 0100 | 84 | Call identity in use |
| 101 | 0101 | 85 | No call suspended |
| 101 | 0110 | 86 | Call having the requested call identity has been cleared |
| 101 | 1000 | 88 | Incompatible destination |
| 101 | 1011 | 91 | Invalid transit network selection |
| 101 | 1111 | 95 | Invalid message, unspecified |
| 110 | 0000 | 96 | Mandatory information element is missing |
| 110 | 0001 | 97 | Message type nonexistent or not implemented |
| 110 | 0010 | 98 | Message not compatible with call state or message type nonexistent or not implemented |
| 110 | 0011 | 99 | Information element nonexistent or not implemented |
| 110 | 0100 | 100 | Invalid information element contents |
| 110 | 0101 | 101 | Message not compatible with call state |
| 110 | 0110 | 102 | Recovery on timer expiry |
| 110 | 1111 | 111 | Protocol error, unspecified |
| 111 | 1111 | 127 | Interworking, unspecified |
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