Outbound Errors

Error

Description

Outbound

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.

Inbound Errors

Error

Description

Inbound

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.

Did this answer your question?