When sending SMS messages, there are a handful or potential error codes, defining whether the message was delivered successfully or a failure:
| Status | Result | Explanation | Maximum Attempts |
|---|---|---|---|
| Success | SentOk | Voice call received and answered successfully | |
| Success | Max Duration | Voice call received and answered successfully and the Max Duration limit (LIM and/or LIMB) was reached | |
| Success | AnswerPhone | Voice call received and answered successfully by an answering machine/voicemail | |
| Success | AnswerPhone Dropped | Voice call received and answered successfully by an answering machine/voicemail. The call was dropped due to your call's settings. | |
| Failed | No Valid Option Selected | 'Require Keypad Button Press' (KeypadOptionRequired) has been enabled for this message and the recipient didn't press a valid keypad button | |
| Failed | Busy | Recipient responded with Busy tone | |
| Failed | No Answer | Call unanswered within 60 seconds | |
| Failed | Fax Machine | Voice call received and answered by a fax machine (not a human) | |
| Failed | Modem | Voice call received and answered by a modem (not a human) | |
| Failed | Invalid Voice Number (RP-Max) | Mobile number is invalid (too many digits for the supplied network/carrier) | 0 |
| Failed | Invalid Voice Number (RP-Min) | Mobile number is invalid (not enough digits for the supplied network/carrier) | 0 |
| Failed | Bad Number (NRD) | Number is invalid (not owned by any network or carrier) | |
| Failed | Bad Number (OC) | Number is invalid (recipient's network or carrier rejected the call) | |
| Failed | Bad Number (Unallocated) | Number is invalid (recipient's network or carrier advises the number is unallocated/unused) | 1 |
| Failed | Bad Number / Congestion | Recipient's network or carrier is unresponsive (likely overloaded with no available capacity) | 1 |
| Failed | Bad Number/No Answer (EM) | Call completed with 0 second duration (likely an operator message stating the number is unavailable) | 1 |
| Failed | Bad Number/No Answer (NUR) | Number is invalid (the recipient's telephone equipment is disconnected) | |
| Failed | Bad Number/No Answer (RTE) | Recipient's network or carrier failed to connect the call | |
| Failed | Temporary Failure (CCD) | Recipient's network or carrier closed the connection when the number was dialled | 1 |
| Failed | Temporary Failure (CR) | Recipient's network or carrier advises the number is valid but is experiencing a temporary fault | 1 |
| Failed | Temporary Failure (NCC) | Recipient's network or carrier is unresponsive (likely overloaded with no available capacity) | 1 |
| Failed | Temporary Failure (NOOO) | Recipient's network or carrier is unresponsive (likely temporarily offline) | 1 |
| Failed | Temporary Failure (NTF) | Recipient's network or carrier advises the number is valid but is experiencing a temporary fault | 1 |
| Failed | Unspecified Hangup (NU) | Unknown failure reason (the Recipient's network or carrier is supplying an unknown error code) | |
| Failed | Call Timed Out | Recipient's network or carrier accepted the call but failed to route or reject the call (no result provided) | 1 |
| Failed | Bad Audio Format | Your submitted audio files are in an incompatible or corrupted format (should be WAV or MP3) | 0 |
| Failed | Job Aborted | Operator or User aborted the message | 0 |
| Failed | No Permit Record | Internal TNZ error; contact TNZ Support | 0 |
Maximum Attempts means the system will limit attempts to the destination number.
For example, if you have set Retry Attempts=3 and the call fails due to Bad Number (Unallocated), the system will not automatically retry the call to that failed number (it will continue with other Contacts and Alt Phones as normal).