| 21 | CALL_REJECTED | Call Rejected | 403 Forbidden |
| 1 | UNALLOCATED | Unallocated (unassigned) number | 404 Not Found |
| 18 | NO_USER_RESPONSE | No user responding | 408 Request Timeout |
| 22 | NUMBER_CHANGED | Number changed | 410 Gone |
| 19 | NO_ANSWER | User alerting, no answer | 480 Temporarily Unavailable |
| 28 | INVALID_NUMBER_FORMAT | Invalid number format | 484 Address Incomplete |
| 17 | USER_BUSY | User busy | 486 Busy Here |
| 58 | BEARERCAPABILITY_NOTAVAIL | Bearer capability not available | 488 Not Acceptable Here |
| 38 | NETWORK_OUT_OF_ORDER | Network out of order | 500 Server Internal Error |
| 29 | FACILITY_REJECTED | Facility rejected | 501 Not Implemented |
| 27 | DESTINATION_OUT_OF_ORDER | Destination out of order | 502 Bad Gateway |
| 34 | NORMAL_CIRCUIT_CONGESTION | Circuit/channel congestion | 503 Service Unavailable |
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