

By default, SMS sender IDs are equipped with a flooding protection mechanism designed to prevent clients from overwhelming recipients with excessive messaging.
While you may request its deactivation by emailing us to support@webio.com (this needs your administrator approval), doing so is generally discouraged for most use cases.
Flooding protection thresholds are as follows:
14 - Unconfirmed - The gateway or network have not confirmed the message has sent or delivered
| Expired | Expired |
| Expired | HLR ERROR - Local Cancel |
| Expired | HLR ERROR - Abort |
| Expired | Message was expired before reaching SMSC. |
| Expired | Message was canceled by user before reaching SMSC. |
| Expired | Message failed due to unknown mobile operator error |
| Expired | Failed message delivery |
| Expired | Message expired before it reached handset |
| Expired | Message submitted to but not acknowledged by mobile operator |
| Expired | Partial message delivery failure |
| Expired | Awaiting complete message delivery status |
| Expired | Temporary system error |
| Expired | Temporary mobile operator system error |
| Expired | Non-retryable mobile operator system error |
| Expired | US standard rate message blocked by the OpenMarket deactivated numbers firewall |
| Invalid number | The outboundChannelAddress is inactive or no longer active. |
| Invalid number | Destination number is not a valid mobile number or its routing cannot be determined. |
| Invalid number | Receiving handset or equipment does not support SMS or an SMS feature. This is temporary because the subscriber could switch to a different device. |
| Invalid number | HLR ERROR - unknown subscriber |
| Invalid number | ESME EXTERNAL ERROR - Invalid source address |
| Invalid number | ESME EXTERNAL ERROR - Request failed |
| Invalid number | Aborted - Unprovisioned region - SMSC rejected the message. The account has not been provisioned for this region. |
| Network error | ROUTING ERROR - Internal routing error |
| Network error | It cannot be determined whether this message has been delivered or has failed due to lack of final delivery state information from the carrier. |
| Network error | ROUTING ERROR - Internal routing error |
| Network error | Rejection due to failed authentication or filtering. |
| Network error | The MSC that the subscriber is currently registered to is experiencing a fault. |
| Network error | Rejection due to SS7 protocol or network failure. |
| Network error | Rejection due to subscriber network decoding error or signalling fault. |
| Network error | Rejection due to subscriber network decoding error or signalling fault. |
| Network error | Rejection due to SS7 protocol or network failure. |
| Network error | Rejection due to subscriber network decoding error or signaling fault. |
| Network error | Rejection due to subscriber network decoding error or signaling fault. |
| Network error | INTERNAL ERROR - Internal error |
| Network error | Generic delivery failure |
| Network error | ESME ERROR - Internal error |
| Network error | Internal SMSC error due to invalid message syntax. |
| Network error | HLR ERROR - System failure |
| Network error | Internal SMSC error caused by SS7 link/dialogue fault. |
| Network error | SMSC cannot decode the response received from destination network due to an encoding or protocol fault. |
| Network error | Subscriber network or signalling partner has terminated the signalling connection |
| Network error | Subscriber network or signalling partner has rejected the signalling connection |
| Network error | Subscriber network not recieving packets from SMSC |
| Network error | Subscriber network or signalling partner has not responded to signalling connection setup or maintenance packets. |
| Network error | Subscriber network refuses signalling connection or message packet. |
| Network error | Signalling with destination network has been prevented by SMSC partner or signalling partner. |
| Network error | SMSC partner or 3rd party signalling partner has prevented messages being sent to this outboundChannelAddress or destination network. |
| Network error | SMSC partner has rejected the message due to an unacceptable message parameter. |
| Network error | SMSC partner could not process this message due to a platform fault |
| Network error | SMSC partner could not process this message due to a platform fault and it will not be retried. |
| Network error | SMSC partner cannot route this message currently |
| Network error | SMSC partner cannot route this message and it will not be retried. |
| Network error | ESME EXTERNAL ERROR - Unknown |
| Network error | An unexpected error caused the message to fail. |
| Network error | Message failed because of temporary delivery failure. Message can be retried. |
| Network error | One or more parameters in the message body has no mapping for this recipient. |
| Network error | SS7 signalling link at destination network |
| Network error | Invalid request type |
| Network error | Carrier ID is not an integer. |
| Network error | Source address is blocked or is not provisioned |
| Network error | Short code expired with mobile operator |
| Network error | Short code blocked by mobile operator |
| Network error | End users connected to this MVNO cannot receive short code messages |
| Network error | Destination address blocked by mobile operator |
| Network error | Destination address not provisioned for SMS |
| Network error | Destination address suspended by mobile operator |
| Network error | Program ID is not provisioned for this mobile operator or is not active |
| Network error | Short code blocked by end user |
| Network error | New subscriptions for this short code are blocked by mobile operator |
| Network error | Account not provisioned to use SMS demo short code |
| Network error | Exceeded the time limit for using SMS demo |
| Network error | Destination address not in whitelist for SMS demo |
| Network error | Exceeded the max number of demo requests |
| Network error | End user out of prepay credit |
| Network error | Exceeded the monthly limit on global MT messaging |
| Network error | SAccount not provisioned for global one- or two-way SMS |
| Network error | Cannot determine which message originator to use |
| Network error | Account has no provisioned address that can reach destination |
| Network error | Interaction not supported for message destination |
| Network error | Your account is not provisioned for global two-way SMS |
| Network error | Content blocked by user opt-out (MO: STOP) |
| Network error | This message was identified as spam and cannot be delivered |
| Network error | Temporary handset failure |
| Network error | Destination overload |
| Network error | Mobile operator network error |
| Network error | SMS rejected by mobile operator for attempted destination address |
| Unavailable | Fault in Number Portability Database or HLR of outboundChannelAddress range holder. Occurs more frequently if number ported more than once in certain countries. |
| Unavailable | Occurs when the MSC that a message has been sent to is not aware of the subscriber IMSI. Suggests HLR has not been updated or MSC malfunction. |
| Unavailable | Rejection due to subscription not supporting SMS. |
| Unavailable | Rejection due to subscription |
| Unavailable | Rejection due to subscription or network not allowing SMS. |
| Unavailable | Rejection due to subscription not supporting SMS. |
| Unavailable | Subscriber handset is not logged onto the network due to it being turned off or out of coverage. Likely to have been unavailable for 12 hours or mor. |
| Unavailable | Subscriber handset is not reachable on the network due to it being turned off or out of coverage. Likely to have very recently become unavailable. |
| Unavailable | Subscriber handset is not reachable on the network due to it being turned off or out of coverage. Likely to have been unavailable for several hours. |
| Unavailable | SCREENING ERROR - Error |
| Unavailable | SCREENING ERROR - Error |
| Unavailable | SCREENING ERROR - Error |
| Unavailable | SCREENING ERROR - Error |
| Unavailable | SCREENING ERROR - Error |
| Unavailable | SMSC ERROR - Reject |
| Unavailable | HLR ERROR - Teleservice not provisioned |
| Unavailable | HLR ERROR - absent subscriber |
| Unavailable | MSC ERROR - Facility not supported |
| Unavailable | MSC ERROR - Equipment protocol error |
| Unavailable | ESME EXTERNAL ERROR - Message queue full |
| Unavailable | SMSC rejected message. Retrying is likely to cause the same error. |
| Unavailable | Invalid request version |
| Unavailable | Invalid request protocol |
| Unavailable | Mobile operator not found for the destination address |
| Unavailable | Unable to determine carrier ID from destination address. |
| Unavailable | Destination address contains non-numeric characters. |
| Unavailable | Invalid destination address |
| Unavailable | Invalid destination address country code |
| Unavailable | Message text is too long |
| Unavailable | Invalid source address |
| Unavailable | Destination address unable to receive SMS |