Outbound Errors
Error | Description |
file_size_limit_exceeded | Error from Telnyx programmable FAX Application indicating the .pdf file provided is greater in size than the prescribed limits. (i.e. bigger than 50MB) |
page_count_limit_exceeded | Error from Telnyx programmable FAX Application indicating the .pdf file provided is containing more number pages than the prescribed limits. (i.e. more than 350 Pages) |
fax_signaling_error | Error from Telnyx Telephony Engine. Includes scenarios such as no response after sending a page, invalid ECM response received from receiver, received bad response to DCS or training. |
file_download_failed | The non-telephony service responsible for downloading the customers PDF prior to initiating the fax was unable to download the file. |
file_format_invalid | The customer file format is not PDF or is invalid PDF. |
receiver_call_dropped | Error from Telnyx Telephony Engine. The call dropped prematurely. |
receiver_communication_error | Error from Telnyx Telephony Engine. Can include general call failure or a telephony routing error. |
receiver_decline | Error from Telnyx Telephony Engine. The destination declined the call attempt. |
receiver_invalid_number_format | Error from Telnyx Telephony Engine. The destination number is not in valid +E.164 format. |
receiver_no_response | Error from Telnyx Telephony Engine. This cause is used when a called party does not respond to a call establishment message with either an alerting or connect indication within the prescribed period of time allocated. |
receiver_recovery_on_timer_expire | Error from Telnyx Telephony Engine. Remote party sends a 408 for call expired or issue with downstream carrier partner. |
receiver_unallocated_number | Error from Telnyx Telephony Engine. This cause indicates that the called party cannot be reached because, although the called party number is in a valid format, it is not currently allocated (assigned). |
service_unavailable | Internal Telnyx error. A call to another service, such as to initiate the outbound call or to retrieve the PDF for sending failed. Could also be due to a non-typical media conversion failure. |
success | Telnyx to investigate this further. |
Retries for outbound faxes which may result in an error must be configured on the client application, Telnyx does not automatically retry faxes with errors.
Inbound Errors
Error | Description |
carrier_lost | Connection to carrier dropped while receiving the fax |
fax_signaling_error | Error from Telnyx Telephony Engine. Similar to outbound error but in reverse. Includes scenarios such as no further data after receiving a page, ECM issue, bad data sent from sender etc. |
received | Telnyx to investigate this further. |
sender_call_dropped | Error from Telnyx Telephony Engine. The call dropped prematurely. |
sender_canceled | Error from Telnyx Telephony Engine. The sender canceled the call prematurely or before data had completed transmitting. |
sender_communication_error | Error from Telnyx Telephony Engine. Can include general call failure or a telephony routing error on the sender side. |