Twilio Migration Guide

As of December 17th, Twilio will go forward with sunsetting support for their Programmable Fax offering. As such, we have outlined a step-by-step guide to make the transition to Telnyx’s Programmable Fax system as painless as possible. This guide will inform and detail the process from start to finish to get you started using Fax with Telnyx! Transitioning is quite simple, as the general configuration of the app mirrors Twilio’s implementation. In most cases, the only change you will have to make in the code itself is the authentication parameters and the send function.

cURL

Part 1: Account configuration

To get started using Programmable Fax with Telnyx, you will be required to make an account and attain the following items. A guide on how to set this up can be found at our Quickstart You will ultimately need the following configured:

A valid Telnyx Portal Account
A Telnyx Outbound Voice Profile (If you are intending to send Faxes Outbound)
A Telnyx Fax Application
A Telnyx Phone Number that’s enabled with a Telnyx Fax Application

Do note, to receive updates and status of your faxes (both inbound and outbound), you will need to setup a Webhook in the Telnyx Fax Application. This is where we will be sending you all information regarding the fax. For more information on this, you can scroll down to “Part 3: Recieving Faxes” section. After your account is configured, take note of the following items that you will need to send your specified faxes programmatically.

Your API V2 Key
Your App ID of the Telnyx Fax Application
Your Phone Number that you procured from the previous step.

That’s it from the portal perspective! With the 3 pieces of information from above we are ready to start sending and recieving faxes with Telnyx!

Part 2: Sending faxes

Sending outbound faxes requires:

A To number (Destination)
A From number (Generally the number you have procured from above)
A public facing URL which points to the document you are intending to send, in PDF format.

The code to initiate a fax sendoff would be as follows:

Don’t forget to update YOUR_API_KEY in the examples.

curl -X POST https://api.telnyx.com/v2/faxes \
  --data-urlencode "media_url=https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf" \
  --data-urlencode "connection_id=YOUR_FAX_APP_ID" \
  --data-urlencode "to=YOUR_DESTINATION_NUMBER" \
  --data-urlencode "from=YOUR_FROM_NUMBER" \
  --header "Authorization: Bearer YOUR_API_KEY"

A successful example JSON response to the request will look like:

{
  "data": {
    "connection_id": "c-1",
    "created_at": "2020-05-05T09:59:12",
    "direction": "outbound",
    "from": "+123",
    "id": "0ccc7b54-4df3-4bca-a65a-3da1ecc777f0",
    "media_url": "http://www.example.com/fax.pdf",
    "quality": "high",
    "record_type": "fax",
    "status": "queued",
    "store_media": true,
    "stored_media_url": "https://s3.amazonaws.com/faxes-dev/user-1/cf4a6b52-bf8e-4945-9f49-611d0d2b083b.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxxxxxxxx%2F20200505%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200505T095917Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=fac2af40464fcc77673ad762db86e34f9c1b91a82699b5578c5327f53874df51",
    "to": "+456",
    "updated_at": "2020-05-05T09:59:12",
    "webhook_failover_url": "",
    "webhook_url": "http://www.example.com/webhooks"
  }
}

Part 3: Receiving faxes

In order to receive faxes, you will need to setup a webhook mentioned earlier. In order for the webhooks in this tutorial to work, Telnyx must be able to send your web application an HTTP request over the Internet. That means your application needs to have a URL or IP address that Telnyx can reach. Telnyx sends webhooks to the URL or IP address to notify your application of incoming faxes. For the purpose of this tutorial, we’re using ngrok, a popular tunneling tool used to expose a locally running application to the internet. ngrok gives you a public URL for a local port on your development machine, which you can use to configure your Telnyx webhooks as described above. Download and install ngrok, then use it at the command line to create a tunnel to whatever port your web application is running on. For example, this command will create a public URL for a web application listening on port 3000.

ngrok http 3000

After executing that command, you will see that ngrok has given your application a public URL that you can use in your webhook connection configuration in the Telnyx Mission Control Portal.

Grab your ngrok public URL and head back to the Programmable Fax Application you configured earlier. Now in the field under “Send a webhook to the URL” enter your new ngrok URL from either of the “Forwarding” URLs ngrok provided us with depending on if you want to use HTTP or HTTPS. You’re now all set up to receive webhooks for events related to inbound faxes. If you use the same Programmable Fax Application for sending faxes, you will receive events to the same ngrok URL you just created.

Example Webhooks

If you have set everything up correctly, any time an inbound fax is received you can expect to receive the following webhooks:

Webhook Name	Description
`fax.receiving.started`	The fax has begun transmitting to Telnyx successfully.
`fax.media.processing.started`	Telnyx has received the fax and is generating the digital PDF file.
`fax.received`	The PDF has been generated and the file is ready to be downloaded.
`fax.failed`	Transmission of the fax failed. Check the `failure_reason` for more details.

Fax has begun transmitting to Telnyx

{
  "data": {
    "event_type": "fax.receiving.started",
    "id": "bc004786-f166-4dd3-8c5d-737990b501bc",
    "occurred_at": "2020-08-27T16:33:29.684247Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "9fbc3f0d-5495-42af-9a4e-c57a235d9182",
      "from": "+16132484872",
      "status": "receiving",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Fax transmission is complete and Telnyx is converting to PDF

{
  "data": {
    "event_type": "fax.media.processing.started",
    "id": "35e33b02-6365-47d0-93b7-3bfec97c467e",
    "occurred_at": "2020-08-27T16:33:33.175396Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "status": "media.processing",
      "page_count": 2,
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

PDF has been generated and is ready for download

The media_url field contains a signed AWS link to a PDF of the received fax. This URL is valid for 10 minutes before the file is no longer accessible so be sure to download the file if you wish to keep it!

{
  "data": {
    "event_type": "fax.received",
    "id": "4844b70c-3c6c-4c3a-ba2e-e4c785f02d24",
    "occurred_at": "2020-08-27T16:33:36.843054Z",
    "payload": {
      "call_duration_secs": 50,
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "media_url": "https://s3.amazonaws.com/faxes-prod/19a75cea-02c6-4b9a-84fa-c9bc8341feb8/f72eebbe-f9b6-4f0f-b652-03e742e110d5.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=...%2F20200827%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200827T163336Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=...",
      "page_count": 2,
      "partial_content": false,
      "status": "received",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Uh oh, something has gone wrong and the fax failed

Inbound faxes can fail for a variety of reasons. Some of the most common reasons are that the sending party hung up before the fax was finished transmitting or didn’t send anything at all.

{
  "data": {
    "event_type": "fax.failed",
    "id": "1a7405a6-696c-4369-a0b1-168e4bb7e22c",
    "occurred_at": "2020-08-27T16:17:51.844250Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "failure_reason": "sender_call_dropped",
      "fax_id": "181533f3-b0b8-4bcd-ab01-b33cd8698508",
      "from": "+16617480240",
      "status": "failed",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Python

Part 1: Account configuration

A valid Telnyx Portal Account
A Telnyx Outbound Voice Profile (If you are intending to send Faxes Outbound)
A Telnyx Fax Application
A Telnyx Phone Number that’s enabled with a Telnyx Fax Appliction

Your API V2 Key
Your App ID of the Telnyx Fax Application
Your Phone Number that you procured from the previous step.

That’s it from the portal perspective! With the 3 pieces of information from above we are ready to start sending and receiving faxes with Telnyx!

Part 2: Sending Faxes

Sending outbound faxes requires:

A To number (Destination)
A From number (Generally the number you have procured from above)
A public facing URL which points to the document you are intending to send, in PDF format.

The code to initiate a fax sendoff would be as follows:

import telnyx

telnyx.api_key = "YOUR_API_KEY"

fax_app_id = "YOUR_FAX_APP_ID"
your_telnyx_number = "YOUR_TELNYX_NUMBER"
desitnation_number = "YOUR_DESIRED_DESTINATION_NUMBER"

fax_send = telnyx.Fax.create(
            connection_id=TELNYX_FAX_CONNECTION_ID,
            to=to_phone_number,
            from_=from_phone_number,
            media_url=file_url
)

A successful example JSON response to the request will look like:

{
  "data": {
    "connection_id": "c-1",
    "created_at": "2020-05-05T09:59:12",
    "direction": "outbound",
    "from": "+123",
    "id": "0ccc7b54-4df3-4bca-a65a-3da1ecc777f0",
    "media_url": "http://www.example.com/fax.pdf",
    "quality": "high",
    "record_type": "fax",
    "status": "queued",
    "store_media": true,
    "stored_media_url": "https://s3.amazonaws.com/faxes-dev/user-1/cf4a6b52-bf8e-4945-9f49-611d0d2b083b.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxxxxxxxx%2F20200505%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200505T095917Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=fac2af40464fcc77673ad762db86e34f9c1b91a82699b5578c5327f53874df51",
    "to": "+456",
    "updated_at": "2020-05-05T09:59:12",
    "webhook_failover_url": "",
    "webhook_url": "http://www.example.com/webhooks"
  }
}

Part 3: Receiving faxes

ngrok http 3000

After executing that command, you will see that ngrok has given your application a public URL that you can use in your webhook connection configuration in the Telnyx Mission Control Portal.

Example Webhooks

If you have set everything up correctly, any time an inbound fax is received you can expect to receive the following webhooks:

Webhook Name	Description
`fax.receiving.started`	The fax has begun transmitting to Telnyx successfully.
`fax.media.processing.started`	Telnyx has received the fax and is generating the digital PDF file.
`fax.received`	The PDF has been generated and the file is ready to be downloaded.
`fax.failed`	Transmission of the fax failed. Check the `failure_reason` for more details.

Fax has begun transmitting to Telnyx

{
  "data": {
    "event_type": "fax.receiving.started",
    "id": "bc004786-f166-4dd3-8c5d-737990b501bc",
    "occurred_at": "2020-08-27T16:33:29.684247Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "9fbc3f0d-5495-42af-9a4e-c57a235d9182",
      "from": "+16132484872",
      "status": "receiving",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Fax transmission is complete and Telnyx is converting to PDF

{
  "data": {
    "event_type": "fax.media.processing.started",
    "id": "35e33b02-6365-47d0-93b7-3bfec97c467e",
    "occurred_at": "2020-08-27T16:33:33.175396Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "status": "media.processing",
      "page_count": 2,
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

PDF has been generated and is ready for download

{
  "data": {
    "event_type": "fax.received",
    "id": "4844b70c-3c6c-4c3a-ba2e-e4c785f02d24",
    "occurred_at": "2020-08-27T16:33:36.843054Z",
    "payload": {
      "call_duration_secs": 50,
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "media_url": "https://s3.amazonaws.com/faxes-prod/19a75cea-02c6-4b9a-84fa-c9bc8341feb8/f72eebbe-f9b6-4f0f-b652-03e742e110d5.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=...%2F20200827%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200827T163336Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=...",
      "page_count": 2,
      "partial_content": false,
      "status": "received",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Uh oh, something has gone wrong and the fax failed

Inbound faxes can fail for a variety of reasons. Some of the most common reasons are that the sending party hung up before the fax was finished transmitting or didn’t send anything at all.

{
  "data": {
    "event_type": "fax.failed",
    "id": "1a7405a6-696c-4369-a0b1-168e4bb7e22c",
    "occurred_at": "2020-08-27T16:17:51.844250Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "failure_reason": "sender_call_dropped",
      "fax_id": "181533f3-b0b8-4bcd-ab01-b33cd8698508",
      "from": "+16617480240",
      "status": "failed",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

PHP

Part 1: Account configuration

A valid Telnyx Portal Account
A Telnyx Outbound Voice Profile (If you are intending to send Faxes Outbound)
A Telnyx Fax Application
A Telnyx Phone Number that’s enabled with a Telnyx Fax Appliction

Your API V2 Key
Your App ID of the Telnyx Fax Application
Your Phone Number that you procured from the previous step.

That’s it from the portal perspective! With the 3 pieces of information from above we are ready to start sending and receiving faxes with Telnyx!

Part 2: Sending Faxes

Sending outbound faxes requires:

A To number (Destination)
A From number (Generally the number you have procured from above)
A public facing URL which points to the document you are intending to send, in PDF format.

The code to initiate a fax sendoff would be as follows:

<?php
require_once __DIR__.'/vendor/autoload.php';

\Telnyx\Telnyx::setApiKey('YOUR_API_KEY');

$your_telnyx_number = 'YOUR_FROM_NUMBER';
$destination_number = 'YOUR_DESTINATION_NUMBER';
$connection_id = 'YOUR_CONNECTIONID';
$media_url = 'YOUR_MEDIA_URL';

$new_fax = \Telnyx\Message::Create(['from' => $your_telnyx_number, 'to' => $destination_number, 'connection_id' => $connection_id, 'media_url' => $media_url]);

A successful example JSON response to the request will look like:

{
  "data": {
    "connection_id": "c-1",
    "created_at": "2020-05-05T09:59:12",
    "direction": "outbound",
    "from": "+123",
    "id": "0ccc7b54-4df3-4bca-a65a-3da1ecc777f0",
    "media_url": "http://www.example.com/fax.pdf",
    "quality": "high",
    "record_type": "fax",
    "status": "queued",
    "store_media": true,
    "stored_media_url": "https://s3.amazonaws.com/faxes-dev/user-1/cf4a6b52-bf8e-4945-9f49-611d0d2b083b.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxxxxxxxx%2F20200505%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200505T095917Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=fac2af40464fcc77673ad762db86e34f9c1b91a82699b5578c5327f53874df51",
    "to": "+456",
    "updated_at": "2020-05-05T09:59:12",
    "webhook_failover_url": "",
    "webhook_url": "http://www.example.com/webhooks"
  }
}

Part 3: Receiving faxes

ngrok http 3000

After executing that command, you will see that ngrok has given your application a public URL that you can use in your webhook connection configuration in the Telnyx Mission Control Portal.

Example Webhooks

If you have set everything up correctly, any time an inbound fax is received you can expect to receive the following webhooks:

Webhook Name	Description
`fax.receiving.started`	The fax has begun transmitting to Telnyx successfully.
`fax.media.processing.started`	Telnyx has received the fax and is generating the digital PDF file.
`fax.received`	The PDF has been generated and the file is ready to be downloaded.
`fax.failed`	Transmission of the fax failed. Check the `failure_reason` for more details.

Fax has begun transmitting to Telnyx

{
  "data": {
    "event_type": "fax.receiving.started",
    "id": "bc004786-f166-4dd3-8c5d-737990b501bc",
    "occurred_at": "2020-08-27T16:33:29.684247Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "9fbc3f0d-5495-42af-9a4e-c57a235d9182",
      "from": "+16132484872",
      "status": "receiving",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Fax transmission is complete and Telnyx is converting to PDF

{
  "data": {
    "event_type": "fax.media.processing.started",
    "id": "35e33b02-6365-47d0-93b7-3bfec97c467e",
    "occurred_at": "2020-08-27T16:33:33.175396Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "status": "media.processing",
      "page_count": 2,
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

PDF has been generated and is ready for download

{
  "data": {
    "event_type": "fax.received",
    "id": "4844b70c-3c6c-4c3a-ba2e-e4c785f02d24",
    "occurred_at": "2020-08-27T16:33:36.843054Z",
    "payload": {
      "call_duration_secs": 50,
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "media_url": "https://s3.amazonaws.com/faxes-prod/19a75cea-02c6-4b9a-84fa-c9bc8341feb8/f72eebbe-f9b6-4f0f-b652-03e742e110d5.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=...%2F20200827%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200827T163336Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=...",
      "page_count": 2,
      "partial_content": false,
      "status": "received",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Uh oh, something has gone wrong and the fax failed

Inbound faxes can fail for a variety of reasons. Some of the most common reasons are that the sending party hung up before the fax was finished transmitting or didn’t send anything at all.

{
  "data": {
    "event_type": "fax.failed",
    "id": "1a7405a6-696c-4369-a0b1-168e4bb7e22c",
    "occurred_at": "2020-08-27T16:17:51.844250Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "failure_reason": "sender_call_dropped",
      "fax_id": "181533f3-b0b8-4bcd-ab01-b33cd8698508",
      "from": "+16617480240",
      "status": "failed",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Node

Part 1: Account Configuration

A valid Telnyx Portal Account
A Telnyx Outbound Voice Profile (If you are intending to send Faxes Outbound)
A Telnyx Fax Application
A Telnyx Phone Number that’s enabled with a Telnyx Fax Appliction

Your API V2 Key
Your App ID of the Telnyx Fax Application
Your Phone Number that you procured from the previous step.

That’s it from the portal perspective! With the 3 pieces of information from above we are ready to start sending and receiving faxes with Telnyx!

Part 2: Sending Faxes

Sending outbound faxes requires:

A To number (Destination)
A From number (Generally the number you have procured from above)
A public facing URL which points to the document you are intending to send, in PDF format.

The code to initiate a fax sendoff would be as follows:

import Telnyx from 'telnyx';

const telnyx = new Telnyx("YOUR_API_KEY");

telnyx.faxes.create(
 {
   'from': 'YOUR_FROM_NUMBER',
   'to': 'YOUR_DESTINATION_NUMBER',
   'connection_id': 'YOUR_FAX_APP_ID'
   'media_url': 'YOUR_MEDIA_URL'
 },
 function(err, response) {
   // asynchronously called
   console.log(response);
 }
);

A successful example JSON response to the request will look like:

{
  "data": {
    "connection_id": "c-1",
    "created_at": "2020-05-05T09:59:12",
    "direction": "outbound",
    "from": "+123",
    "id": "0ccc7b54-4df3-4bca-a65a-3da1ecc777f0",
    "media_url": "http://www.example.com/fax.pdf",
    "quality": "high",
    "record_type": "fax",
    "status": "queued",
    "store_media": true,
    "stored_media_url": "https://s3.amazonaws.com/faxes-dev/user-1/cf4a6b52-bf8e-4945-9f49-611d0d2b083b.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxxxxxxxx%2F20200505%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200505T095917Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=fac2af40464fcc77673ad762db86e34f9c1b91a82699b5578c5327f53874df51",
    "to": "+456",
    "updated_at": "2020-05-05T09:59:12",
    "webhook_failover_url": "",
    "webhook_url": "http://www.example.com/webhooks"
  }
}

Part 3: Receiving Faxes

ngrok http 3000

After executing that command, you will see that ngrok has given your application a public URL that you can use in your webhook connection configuration in the Telnyx Mission Control Portal.

Example Webhooks

If you have set everything up correctly, any time an inbound fax is received you can expect to receive the following webhooks:

Webhook Name	Description
`fax.receiving.started`	The fax has begun transmitting to Telnyx successfully.
`fax.media.processing.started`	Telnyx has received the fax and is generating the digital PDF file.
`fax.received`	The PDF has been generated and the file is ready to be downloaded.
`fax.failed`	Transmission of the fax failed. Check the `failure_reason` for more details.

Fax has begun transmitting to Telnyx

{
  "data": {
    "event_type": "fax.receiving.started",
    "id": "bc004786-f166-4dd3-8c5d-737990b501bc",
    "occurred_at": "2020-08-27T16:33:29.684247Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "9fbc3f0d-5495-42af-9a4e-c57a235d9182",
      "from": "+16132484872",
      "status": "receiving",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Fax transmission is complete and Telnyx is converting to PDF

{
  "data": {
    "event_type": "fax.media.processing.started",
    "id": "35e33b02-6365-47d0-93b7-3bfec97c467e",
    "occurred_at": "2020-08-27T16:33:33.175396Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "status": "media.processing",
      "page_count": 2,
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

PDF has been generated and is ready for download

{
  "data": {
    "event_type": "fax.received",
    "id": "4844b70c-3c6c-4c3a-ba2e-e4c785f02d24",
    "occurred_at": "2020-08-27T16:33:36.843054Z",
    "payload": {
      "call_duration_secs": 50,
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "media_url": "https://s3.amazonaws.com/faxes-prod/19a75cea-02c6-4b9a-84fa-c9bc8341feb8/f72eebbe-f9b6-4f0f-b652-03e742e110d5.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=...%2F20200827%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200827T163336Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=...",
      "page_count": 2,
      "partial_content": false,
      "status": "received",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Uh oh, something has gone wrong and the fax failed

Inbound faxes can fail for a variety of reasons. Some of the most common reasons are that the sending party hung up before the fax was finished transmitting or didn’t send anything at all.

{
  "data": {
    "event_type": "fax.failed",
    "id": "1a7405a6-696c-4369-a0b1-168e4bb7e22c",
    "occurred_at": "2020-08-27T16:17:51.844250Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "failure_reason": "sender_call_dropped",
      "fax_id": "181533f3-b0b8-4bcd-ab01-b33cd8698508",
      "from": "+16617480240",
      "status": "failed",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Java

Part 1: Account Configuration

A valid Telnyx Portal Account
A Telnyx Outbound Voice Profile (If you are intending to send Faxes Outbound)
A Telnyx Fax Application
A Telnyx Phone Number that’s enabled with a Telnyx Fax Appliction

Do note, to receive updates and status of your faxes (both inbound and outbound), you will need to setup a Webhook in the Telnyx Fax Application. This is where we will be sending you all information regarding the fax. For more information on this, you can scroll down to “Part 3: Receiving Faxes” section. After your account is configured, take note of the following items that you will need to send your specified faxes programmatically.

Your API V2 Key
Your App ID of the Telnyx Fax Application
Your Phone Number that you procured from the previous step.

That’s it from the portal perspective! With the 3 pieces of information from above we are ready to start sending and receiving faxes with Telnyx!

Part 2: Sending faxes

Sending outbound faxes requires:

A To number (Destination)
A From number (Generally the number you have procured from above)
A public facing URL which points to the document you are intending to send, in PDF format.

The code to initiate a fax sendoff would be as follows:

curl -X POST https://api.telnyx.com/v2/faxes \
--data-urlencode "media_url=https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf" \
--data-urlencode "connection_id=YOUR_FAX_APP_ID" \
--data-urlencode "to=YOUR_DESTINATION_NUMBER" \
--data-urlencode "from=YOUR_FROM_NUMBER" \
--header "Authorization: Bearer YOUR_API_KEY"

A successful example JSON response to the request will look like:

{
  "data": {
    "connection_id": "c-1",
    "created_at": "2020-05-05T09:59:12",
    "direction": "outbound",
    "from": "+123",
    "id": "0ccc7b54-4df3-4bca-a65a-3da1ecc777f0",
    "media_url": "http://www.example.com/fax.pdf",
    "quality": "high",
    "record_type": "fax",
    "status": "queued",
    "store_media": true,
    "stored_media_url": "https://s3.amazonaws.com/faxes-dev/user-1/cf4a6b52-bf8e-4945-9f49-611d0d2b083b.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxxxxxxxx%2F20200505%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200505T095917Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=fac2af40464fcc77673ad762db86e34f9c1b91a82699b5578c5327f53874df51",
    "to": "+456",
    "updated_at": "2020-05-05T09:59:12",
    "webhook_failover_url": "",
    "webhook_url": "http://www.example.com/webhooks"
  }
}

Part 3: Receiving faxes

ngrok http 3000

After executing that command, you will see that ngrok has given your application a public URL that you can use in your webhook connection configuration in the Telnyx Mission Control Portal.

Example Webhooks

If you have set everything up correctly, any time an inbound fax is received you can expect to receive the following webhooks:

Webhook Name	Description
`fax.receiving.started`	The fax has begun transmitting to Telnyx successfully.
`fax.media.processing.started`	Telnyx has received the fax and is generating the digital PDF file.
`fax.received`	The PDF has been generated and the file is ready to be downloaded.
`fax.failed`	Transmission of the fax failed. Check the `failure_reason` for more details.

Fax has begun transmitting to Telnyx

{
  "data": {
    "event_type": "fax.receiving.started",
    "id": "bc004786-f166-4dd3-8c5d-737990b501bc",
    "occurred_at": "2020-08-27T16:33:29.684247Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "9fbc3f0d-5495-42af-9a4e-c57a235d9182",
      "from": "+16132484872",
      "status": "receiving",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Fax transmission is complete and Telnyx is converting to PDF

{
  "data": {
    "event_type": "fax.media.processing.started",
    "id": "35e33b02-6365-47d0-93b7-3bfec97c467e",
    "occurred_at": "2020-08-27T16:33:33.175396Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "status": "media.processing",
      "page_count": 2,
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

PDF has been generated and is ready for download

{
  "data": {
    "event_type": "fax.received",
    "id": "4844b70c-3c6c-4c3a-ba2e-e4c785f02d24",
    "occurred_at": "2020-08-27T16:33:36.843054Z",
    "payload": {
      "call_duration_secs": 50,
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "media_url": "https://s3.amazonaws.com/faxes-prod/19a75cea-02c6-4b9a-84fa-c9bc8341feb8/f72eebbe-f9b6-4f0f-b652-03e742e110d5.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=...%2F20200827%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200827T163336Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=...",
      "page_count": 2,
      "partial_content": false,
      "status": "received",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Uh oh, something has gone wrong and the fax failed

Inbound faxes can fail for a variety of reasons. Some of the most common reasons are that the sending party hung up before the fax was finished transmitting or didn’t send anything at all.

{
  "data": {
    "event_type": "fax.failed",
    "id": "1a7405a6-696c-4369-a0b1-168e4bb7e22c",
    "occurred_at": "2020-08-27T16:17:51.844250Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "failure_reason": "sender_call_dropped",
      "fax_id": "181533f3-b0b8-4bcd-ab01-b33cd8698508",
      "from": "+16617480240",
      "status": "failed",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

.NET

Part 1: Account configuration

A valid Telnyx Portal Account
A Telnyx Outbound Voice Profile (If you are intending to send Faxes Outbound)
A Telnyx Fax Application
A Telnyx Phone Number that’s enabled with a Telnyx Fax Appliction

Do note, to recieve updates and status of your faxes (both inbound and outbound), you will need to setup a Webhook in the Telnyx Fax Application. This is where we will be sending you all information regarding the fax. For more information on this, you can scroll down to “Part 3: Recieving Faxes” section. After your account is configured, take note of the following items that you will need to send your specified faxes programmatically.

Your API V2 Key
Your App ID of the Telnyx Fax Application
Your Phone Number that you procured from the previous step.

That’s it from the portal perspective! With the 3 pieces of information from above we are ready to start sending and recieving faxes with Telnyx!

Part 2: Sending faxes

Sending outbound faxes requires:

A To number (Destination)
A From number (Generally the number you have procured from above)
A public facing URL which points to the document you are intending to send, in PDF format.

Follow the steps below to send Fax messages with dotnet core v3.1+

Using the dotnet CLI create a new console application and change directories to the newly created folder. Then add the Telnyx.net package.

$ dotnet new console --output send-fax
$ cd send-fax
$ dotnet add package Telnyx.net

Open the ‘Program.cs’ file created for you in the directory. It should look something like the code below:

using System;

namespace send_sms
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
        }
    }
}

Tell the application to use Telnyx.net by adding: using Telnyx; before the namespace
In order to use the Asynchronous methods, we need to modify our Main method to return a Task and make it async. 4.1 static void Main(string[] args) should be static async Task Main(string[] args) 4.2 Add using System.Threading.Tasks;before thenamespace`

A successful example JSON response to the request will look like:

{
  "data": {
    "connection_id": "c-1",
    "created_at": "2020-05-05T09:59:12",
    "direction": "outbound",
    "from": "+123",
    "id": "0ccc7b54-4df3-4bca-a65a-3da1ecc777f0",
    "media_url": "http://www.example.com/fax.pdf",
    "quality": "high",
    "record_type": "fax",
    "status": "queued",
    "store_media": true,
    "stored_media_url": "https://s3.amazonaws.com/faxes-dev/user-1/cf4a6b52-bf8e-4945-9f49-611d0d2b083b.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxxxxxxxx%2F20200505%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200505T095917Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=fac2af40464fcc77673ad762db86e34f9c1b91a82699b5578c5327f53874df51",
    "to": "+456",
    "updated_at": "2020-05-05T09:59:12",
    "webhook_failover_url": "",
    "webhook_url": "http://www.example.com/webhooks"
  }
}

Part 3: Recieving faxes

ngrok http 3000

After executing that command, you will see that ngrok has given your application a public URL that you can use in your webhook connection configuration in the Telnyx Mission Control Portal.

Example Webhooks

If you have set everything up correctly, any time an inbound fax is received you can expect to receive the following webhooks:

Webhook Name	Description
`fax.receiving.started`	The fax has begun transmitting to Telnyx successfully.
`fax.media.processing.started`	Telnyx has received the fax and is generating the digital PDF file.
`fax.received`	The PDF has been generated and the file is ready to be downloaded.
`fax.failed`	Transmission of the fax failed. Check the `failure_reason` for more details.

Fax has begun transmitting to Telnyx

{
  "data": {
    "event_type": "fax.receiving.started",
    "id": "bc004786-f166-4dd3-8c5d-737990b501bc",
    "occurred_at": "2020-08-27T16:33:29.684247Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "9fbc3f0d-5495-42af-9a4e-c57a235d9182",
      "from": "+16132484872",
      "status": "receiving",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Fax transmission is complete and Telnyx is converting to PDF

{
  "data": {
    "event_type": "fax.media.processing.started",
    "id": "35e33b02-6365-47d0-93b7-3bfec97c467e",
    "occurred_at": "2020-08-27T16:33:33.175396Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "status": "media.processing",
      "page_count": 2,
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

PDF has been generated and is ready for download

{
  "data": {
    "event_type": "fax.received",
    "id": "4844b70c-3c6c-4c3a-ba2e-e4c785f02d24",
    "occurred_at": "2020-08-27T16:33:36.843054Z",
    "payload": {
      "call_duration_secs": 50,
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "media_url": "https://s3.amazonaws.com/faxes-prod/19a75cea-02c6-4b9a-84fa-c9bc8341feb8/f72eebbe-f9b6-4f0f-b652-03e742e110d5.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=...%2F20200827%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200827T163336Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=...",
      "page_count": 2,
      "partial_content": false,
      "status": "received",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Uh oh, something has gone wrong and the fax failed

Inbound faxes can fail for a variety of reasons. Some of the most common reasons are that the sending party hung up before the fax was finished transmitting or didn’t send anything at all.

{
  "data": {
    "event_type": "fax.failed",
    "id": "1a7405a6-696c-4369-a0b1-168e4bb7e22c",
    "occurred_at": "2020-08-27T16:17:51.844250Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "failure_reason": "sender_call_dropped",
      "fax_id": "181533f3-b0b8-4bcd-ab01-b33cd8698508",
      "from": "+16617480240",
      "status": "failed",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Ruby

Part 1: Account configuration

A valid Telnyx Portal Account
A Telnyx Outbound Voice Profile (If you are intending to send Faxes Outbound)
A Telnyx Fax Application
A Telnyx Phone Number that’s enabled with a Telnyx Fax Appliction

Your API V2 Key
Your App ID of the Telnyx Fax Application
Your Phone Number that you procured from the previous step.

That’s it from the portal perspective! With the 3 pieces of information from above we are ready to start sending and recieving faxes with Telnyx!

Part 2: Sending faxes

Sending outbound faxes requires:

A To number (Destination)
A From number (Generally the number you have procured from above)
A public facing URL which points to the document you are intending to send, in PDF format.

The code to initiate a fax sendoff would be as follows:

curl -X POST https://api.telnyx.com/v2/faxes \
--data-urlencode "media_url=https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf" \
--data-urlencode "connection_id=YOUR_FAX_APP_ID" \
--data-urlencode "to=YOUR_DESTINATION_NUMBER" \
--data-urlencode "from=YOUR_FROM_NUMBER" \
--header "Authorization: Bearer YOUR_API_KEY"

A successful example JSON response to the request will look like:

{
  "data": {
    "connection_id": "c-1",
    "created_at": "2020-05-05T09:59:12",
    "direction": "outbound",
    "from": "+123",
    "id": "0ccc7b54-4df3-4bca-a65a-3da1ecc777f0",
    "media_url": "http://www.example.com/fax.pdf",
    "quality": "high",
    "record_type": "fax",
    "status": "queued",
    "store_media": true,
    "stored_media_url": "https://s3.amazonaws.com/faxes-dev/user-1/cf4a6b52-bf8e-4945-9f49-611d0d2b083b.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxxxxxxxx%2F20200505%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200505T095917Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=fac2af40464fcc77673ad762db86e34f9c1b91a82699b5578c5327f53874df51",
    "to": "+456",
    "updated_at": "2020-05-05T09:59:12",
    "webhook_failover_url": "",
    "webhook_url": "http://www.example.com/webhooks"
  }
}

Part 3: Receiving faxes

ngrok http 3000

After executing that command, you will see that ngrok has given your application a public URL that you can use in your webhook connection configuration in the Telnyx Mission Control Portal.

Example Webhooks

If you have set everything up correctly, any time an inbound fax is received you can expect to receive the following webhooks:

Webhook Name	Description
`fax.receiving.started`	The fax has begun transmitting to Telnyx successfully.
`fax.media.processing.started`	Telnyx has received the fax and is generating the digital PDF file.
`fax.received`	The PDF has been generated and the file is ready to be downloaded.
`fax.failed`	Transmission of the fax failed. Check the `failure_reason` for more details.

Fax has begun transmitting to Telnyx

{
  "data": {
    "event_type": "fax.receiving.started",
    "id": "bc004786-f166-4dd3-8c5d-737990b501bc",
    "occurred_at": "2020-08-27T16:33:29.684247Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "9fbc3f0d-5495-42af-9a4e-c57a235d9182",
      "from": "+16132484872",
      "status": "receiving",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Fax transmission is complete and Telnyx is converting to PDF

{
  "data": {
    "event_type": "fax.media.processing.started",
    "id": "35e33b02-6365-47d0-93b7-3bfec97c467e",
    "occurred_at": "2020-08-27T16:33:33.175396Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "status": "media.processing",
      "page_count": 2,
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

PDF has been generated and is ready for download

{
  "data": {
    "event_type": "fax.received",
    "id": "4844b70c-3c6c-4c3a-ba2e-e4c785f02d24",
    "occurred_at": "2020-08-27T16:33:36.843054Z",
    "payload": {
      "call_duration_secs": 50,
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "fax_id": "f72eebbe-f9b6-4f0f-b652-03e742e110d5",
      "from": "+16132484850",
      "media_url": "https://s3.amazonaws.com/faxes-prod/19a75cea-02c6-4b9a-84fa-c9bc8341feb8/f72eebbe-f9b6-4f0f-b652-03e742e110d5.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=...%2F20200827%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200827T163336Z&X-Amz-Expires=7200&X-Amz-SignedHeaders=host&X-Amz-Signature=...",
      "page_count": 2,
      "partial_content": false,
      "status": "received",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Uh oh, something has gone wrong and the fax failed

Inbound faxes can fail for a variety of reasons. Some of the most common reasons are that the sending party hung up before the fax was finished transmitting or didn’t send anything at all.

{
  "data": {
    "event_type": "fax.failed",
    "id": "1a7405a6-696c-4369-a0b1-168e4bb7e22c",
    "occurred_at": "2020-08-27T16:17:51.844250Z",
    "payload": {
      "connection_id": "1447842681660114324",
      "direction": "inbound",
      "failure_reason": "sender_call_dropped",
      "fax_id": "181533f3-b0b8-4bcd-ab01-b33cd8698508",
      "from": "+16617480240",
      "status": "failed",
      "to": "+17733372863",
      "user_id": "19a75cea-02c6-4b9a-84fa-c9bc8341feb8"
    },
    "record_type": "event"
  },
  "meta": {
    "attempt": 1,
    "delivered_to": "https://1a3097.ngrok.io/"
  }
}

Messaging migration to SMS/MMS API

AI glossary

⌘I

​cURL

​Part 1: Account configuration

​Part 2: Sending faxes

​Part 3: Receiving faxes

​Example Webhooks

​Fax has begun transmitting to Telnyx

​Fax transmission is complete and Telnyx is converting to PDF

​PDF has been generated and is ready for download

​Uh oh, something has gone wrong and the fax failed

​Python

​Part 1: Account configuration

​Part 2: Sending Faxes

​Part 3: Receiving faxes

​Example Webhooks

​Fax has begun transmitting to Telnyx

​Fax transmission is complete and Telnyx is converting to PDF

​PDF has been generated and is ready for download

​Uh oh, something has gone wrong and the fax failed

​PHP

​Part 1: Account configuration

​Part 2: Sending Faxes

​Part 3: Receiving faxes

​Example Webhooks

​Fax has begun transmitting to Telnyx

​Fax transmission is complete and Telnyx is converting to PDF

​PDF has been generated and is ready for download

​Uh oh, something has gone wrong and the fax failed

​Node

​Part 1: Account Configuration

​Part 2: Sending Faxes

​Part 3: Receiving Faxes

​Example Webhooks

​Fax has begun transmitting to Telnyx

​Fax transmission is complete and Telnyx is converting to PDF

​PDF has been generated and is ready for download

​Uh oh, something has gone wrong and the fax failed

​Java

​Part 1: Account Configuration

​Part 2: Sending faxes

​Part 3: Receiving faxes

​Example Webhooks

​Fax has begun transmitting to Telnyx

​Fax transmission is complete and Telnyx is converting to PDF

​PDF has been generated and is ready for download

​Uh oh, something has gone wrong and the fax failed

​.NET

​Part 1: Account configuration

​Part 2: Sending faxes

​Part 3: Recieving faxes

​Example Webhooks

​Fax has begun transmitting to Telnyx

​Fax transmission is complete and Telnyx is converting to PDF

​PDF has been generated and is ready for download

​Uh oh, something has gone wrong and the fax failed

​Ruby

​Part 1: Account configuration

​Part 2: Sending faxes

​Part 3: Receiving faxes

​Example Webhooks

​Fax has begun transmitting to Telnyx

​Fax transmission is complete and Telnyx is converting to PDF

​PDF has been generated and is ready for download

​Uh oh, something has gone wrong and the fax failed

cURL

Part 1: Account configuration

Part 2: Sending faxes

Part 3: Receiving faxes

Example Webhooks

Fax has begun transmitting to Telnyx

Fax transmission is complete and Telnyx is converting to PDF

PDF has been generated and is ready for download

Uh oh, something has gone wrong and the fax failed

Python

Part 1: Account configuration

Part 2: Sending Faxes

Part 3: Receiving faxes

Example Webhooks

Fax has begun transmitting to Telnyx

Fax transmission is complete and Telnyx is converting to PDF

PDF has been generated and is ready for download

Uh oh, something has gone wrong and the fax failed

PHP

Part 1: Account configuration

Part 2: Sending Faxes

Part 3: Receiving faxes

Example Webhooks

Fax has begun transmitting to Telnyx

Fax transmission is complete and Telnyx is converting to PDF

PDF has been generated and is ready for download

Uh oh, something has gone wrong and the fax failed

Node

Part 1: Account Configuration

Part 2: Sending Faxes

Part 3: Receiving Faxes

Example Webhooks

Fax has begun transmitting to Telnyx

Fax transmission is complete and Telnyx is converting to PDF

PDF has been generated and is ready for download

Uh oh, something has gone wrong and the fax failed

Java

Part 1: Account Configuration

Part 2: Sending faxes

Part 3: Receiving faxes

Example Webhooks

Fax has begun transmitting to Telnyx

Fax transmission is complete and Telnyx is converting to PDF

PDF has been generated and is ready for download

Uh oh, something has gone wrong and the fax failed

.NET

Part 1: Account configuration

Part 2: Sending faxes

Part 3: Recieving faxes

Example Webhooks

Fax has begun transmitting to Telnyx

Fax transmission is complete and Telnyx is converting to PDF

PDF has been generated and is ready for download

Uh oh, something has gone wrong and the fax failed

Ruby

Part 1: Account configuration

Part 2: Sending faxes

Part 3: Receiving faxes

Example Webhooks

Fax has begun transmitting to Telnyx

Fax transmission is complete and Telnyx is converting to PDF

PDF has been generated and is ready for download

Uh oh, something has gone wrong and the fax failed