| 1 | Unallocated (unassigned) number | UNALLOCATED_NUMBER | 404 |
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| 2 | No route to specified transit network | NO_ROUTE_TRANSIT_NET | 404 |
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| 3 | No route to destination | NO_ROUTE_DESTINATION | 404 |
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| 4 | Send special information tone | | |
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| 5 | Misdialled trunk prefix | | |
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| 6 | Channel unacceptable | CHANNEL_UNACCEPTABLE | |
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| 7 | Call awarded, being delivered in an established channel | | |
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| 8 | Preemption | | |
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| 9 | Preemption, circuit reserved for reuse | | |
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| 14 | Number ported, query on release | | |
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| 16 | Normal call clearing | NORMAL_CLEARING | |
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| 17 | User busy | USER_BUSY | 486 |
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| 18 | No user responding | NO_USER_RESPONSE | 408 |
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| 19 | No answer from user (user alerted) | NO_ANSWER | 480 |
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| 20 | Subscriber absent | SUBSCRIBER_ABSENT | 480 |
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| 21 | Call rejected | CALL_REJECTED | 403 |
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| 22 | Number changed | NUMBER_CHANGED | 410 |
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| 23 | Redirection to new destination | REDIRECTION_TO_NEW_DESTINATION | 410 |
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| 25 | Exchange routing error | EXCHANGE_ROUTING_ERROR | |
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| 26 | Non-selected user clearing | | 404 |
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| 27 | Destination out of order | DESTINATION_OUT_OF_ORDER | 502 |
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| 28 | Invalid number format (address incomplete) | INVALID_NUMBER_FORMAT | 484 |
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| 29 | Facility rejected | FACILITY_REJECTED | 501 |
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| 30 | Response to STATUS ENQUIRY | RESPONSE_TO_STATUS_ENQUIRY | |
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| 31 | Normal, unspecified | NORMAL_UNSPECIFIED | 480 |
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| 34 | No circuit/channel available | NORMAL_CIRCUIT_CONGESTION | 503 |
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| 38 | Network out of order | NETWORK_OUT_OF_ORDER | 503 |
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| 41 | Temporary failure | NORMAL_TEMPORARY_FAILURE | 503 |
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| 42 | Switching equipment congestion | SWITCH_CONGESTION | 503 |
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| 43 | Access information discarded | ACCESS_INFO_DISCARDED | |
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| 44 | Requested circuit/channel not available | REQUESTED_CHAN_UNAVAIL | |
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| 46 | Precedence call blocked | | |
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| 47 | Resource unavailable, unspecified | | 503 |
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| 49 | Quality of service not available | | |
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| 50 | Requested facility not subscribed | FACILITY_NOT_SUBSCRIBED | |
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| 53 | Outgoing calls barred within CUG | | |
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| 55 | Incoming calls barred within CUG | | 403 |
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| 57 | Bearer capability not authorized | BEARERCAPABILITY_NOTAUTH | 403 |
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| 58 | Bearer capability not presently available | BEARERCAPABILITY_NOTAVAIL | 503 |
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| 62 | Inconsistency in outgoing access information and subscriber class | | |
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| 63 | Service or option not available, unspecified | SERVICE_UNAVAILABLE | |
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| 65 | Bearer capability not implemented | BEARERCAPABILITY_NOTIMPL | 488 |
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| 66 | Channel type not implemented | CHAN_NOT_IMPLEMENTED | |
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| 69 | Requested facility not implemented | FACILITY_NOT_IMPLEMENTED | 501 |
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| 70 | Only restricted digital information bearer capability is available | | 488 |
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| 79 | Service or option not implemented, unspecified | SERVICE_NOT_IMPLEMENTED | 501 |
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| 81 | Invalid call reference value | INVALID_CALL_REFERENCE | |
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| 82 | Identified channel does not exist | | |
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| 83 | A suspended call exists, but this call identity does not | | |
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| 84 | Call identity in use | | |
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| 85 | No call suspended | | |
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| 86 | Call having the requested call identity has been cleared | | |
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| 87 | User not member of CUG | | 403 |
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| 88 | Incompatible destination | INCOMPATIBLE_DESTINATION | 503 |
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| 90 | Non-existent CUG | | |
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| 91 | Invalid transit network selection | | |
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| 95 | Invalid message, unspecified | INVALID_MSG_UNSPECIFIED | |
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| 96 | Mandatory information element is missing | MANDATORY_IE_MISSING | |
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| 97 | Message type non-existent or not implemented | MESSAGE_TYPE_NONEXIST | |
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| 98 | Message not compatible with call state | WRONG_MESSAGE | |
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| 99 | Information element non-existent or not implemented | IE_NONEXIST | |
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| 100 | Invalid information element contents | INVALID_IE_CONTENTS | |
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| 101 | Message not compatible with call state | WRONG_CALL_STATE | |
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| 102 | Recovery on timer expiry | RECOVERY_ON_TIMER_EXPIRE | 504 |
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| 103 | Parameter non-existent or not implemented, passed on | | |
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| 110 | Message with unrecognized parameter, discarded | | |
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| 111 | Protocol error, unspecified | PROTOCOL_ERROR | 500 |
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| 127 | Interworking, unspecified | INTERWORKING | 500 |
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