Subject to enhanced details available on from outbound route, the following error codes can be sent by 8x8 in the delivery reports
| Code | Reason |
|---|---|
| 0 | No reason code |
| 1 | Absent subscriber |
| 2 | Content related error |
| 3 | Data missing |
| 4 | Deferred delivery |
| 5 | Pending upstream |
| 7 | Delivery failure |
| 8 | Deny |
| 9 | Equipment protocol error |
| 10 | ESME external error |
| 11 | Flooding |
| 12 | HLR error |
| 13 | Illegal subscriber or equipment |
| 14 | Internal error |
| 15 | Invalid destination |
| 16 | Invalid format |
| 17 | Invalid message length |
| 18 | Invalid parameter |
| 19 | Invalid source address |
| 20 | Local cancel |
| 21 | Memory capacity exceeded |
| 22 | Message being retried |
| 23 | Network failure |
| 24 | Age verification failure |
| 25 | Operation aborted by receiving network or user |
| 26 | Operation barred |
| 27 | Permanent operator error |
| 28 | Permanent phone error |
| 29 | Phone related error |
| 30 | Portability error |
| 31 | Premium SMS error |
| 32 | Roaming subscriber |
| 33 | Route error |
| 34 | Screening error |
| 35 | Service center congestion |
| 36 | SMS expired |
| 37 | SMS facility not supported |
| 38 | SMS malformed |
| 39 | SMSC cancel |
| 40 | SMSC error |
| 41 | SMSC reject |
| 42 | Source credit insufficiency |
| 43 | Spam filter |
| 44 | Subscriber billing issue |
| 45 | Subscriber busy for SMS |
| 46 | Subscriber not reachable |
| 47 | Subscriber temporary unavailable |
| 48 | System failure |
| 49 | TCAP error |
| 50 | Throttling error |
| 51 | Time out error |
| 52 | Unable to decode the response |
| 53 | Unexpected data value |
| 54 | Unexpected error |
| 55 | Unidentified subscriber |
| 56 | Unknown delivery state |
| 57 | Unknown error |
| 58 | Unknown service center |
| 59 | Unknown subscriber |
| 60 | Content filtered |
| 61 | Session expired |