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Send a fax

POST 
/faxes

Send a fax. Files have size limits and page count limit validations. If a file is bigger than 50MB or has more than 350 pages it will fail with file_size_limit_exceeded and page_count_limit_exceeded respectively.

Expected Webhooks:

  • fax.queued
  • fax.media.processed
  • fax.sending.started
  • fax.delivered
  • fax.failed

Request ​

Body

required

Send fax request

    connection_id stringrequired

    The connection ID to send the fax with.

    media_url MediaUrl (string)

    The URL (or list of URLs) to the PDF used for the fax's media. media_url and media_name/contents can't be submitted together.

    media_name MediaName (string)

    The media_name used for the fax's media. Must point to a file previously uploaded to api.telnyx.com/v2/media by the same user/organization. media_name and media_url/contents can't be submitted together.

    to To (string)required

    The phone number, in E.164 format, the fax will be sent to or SIP URI

    from From (string)required

    The phone number, in E.164 format, the fax will be sent from.

    from_display_name string

    The from_display_name string to be used as the caller id name (SIP From Display Name) presented to the destination (to number). The string should have a maximum of 128 characters, containing only letters, numbers, spaces, and -_~!.+ special characters. If ommited, the display name will be the same as the number in the from field.

    quality Quality (string)

    Possible values: [normal, high, very_high, ultra_light, ultra_dark]

    Default value: high

    The quality of the fax. The ultra settings provides the highest quality available, but also present longer fax processing times. ultra_light is best suited for images, wihle ultra_dark is best suited for text.

    t38_enabled boolean

    Default value: true

    The flag to disable the T.38 protocol.

    monochrome boolean

    The flag to enable monochrome, true black and white fax results.

    store_media boolean

    Should fax media be stored on temporary URL. It does not support media_name, they can't be submitted together.

    store_preview boolean

    Should fax preview be stored on temporary URL.

    preview_format string

    Possible values: [pdf, tiff]

    Default value: tiff

    The format for the preview file in case the store_preview is true.

    webhook_url string

    Use this field to override the URL to which Telnyx will send subsequent webhooks for this fax.

    client_state string

    Use this field to add state to every subsequent webhook. It must be a valid Base-64 encoded string.

Responses ​

202: Send fax response

Schema

    data

    object

    record_type string

    Possible values: [fax]

    Identifies the type of the resource.

    id uuid

    Identifies the type of resource.

    connection_id ConnectionId (string)

    The ID of the connection used to send the fax.

    direction Direction (string)

    Possible values: [inbound, outbound]

    The direction of the fax.

    media_url MediaUrl (string)

    The URL (or list of URLs) to the PDF used for the fax's media. media_url and media_name/contents can't be submitted together.

    media_name MediaName (string)

    The media_name used for the fax's media. Must point to a file previously uploaded to api.telnyx.com/v2/media by the same user/organization. media_name and media_url/contents can't be submitted together.

    to To (string)

    The phone number, in E.164 format, the fax will be sent to or SIP URI

    from From (string)

    The phone number, in E.164 format, the fax will be sent from.

    from_display_name string

    The string used as the caller id name (SIP From Display Name) presented to the destination (to number).

    quality Quality (string)

    Possible values: [normal, high, very_high, ultra_light, ultra_dark]

    Default value: high

    The quality of the fax. The ultra settings provides the highest quality available, but also present longer fax processing times. ultra_light is best suited for images, wihle ultra_dark is best suited for text.

    status string

    Possible values: [queued, media.processed, originated, sending, delivered, failed, initiated, receiving, media.processing, received]

    Status of the fax

    webhook_url string

    URL that will receive fax webhooks

    webhook_failover_url string

    Optional failover URL that will receive fax webhooks if webhook_url doesn't return a 2XX response

    store_media boolean

    Should fax media be stored on temporary URL. It does not support media_name.

    stored_media_url string

    If store_media was set to true, this is a link to temporary location. Link expires after 10 minutes.

    preview_url string

    If store_preview was set to true, this is a link to temporary location. Link expires after 10 minutes.

    client_state string

    State received from a command.

    created_at date-time

    ISO 8601 timestamp when resource was created

    updated_at date-time

    ISO 8601 timestamp when resource was updated

default: Unexpected error

Schema

    errors

    object[]

  • Array [

    • code stringrequired
    title stringrequired
    detail string

    source

    object

    pointer string

    JSON pointer (RFC6901) to the offending entity.

    parameter string

    Indicates which query parameter caused the error.

    meta

    object

    property name* any

  • ]

Callbacks ​

Request samples

curl -L 'https://api.telnyx.com/v2/faxes' \
-H 'Content-Type: application/json' \
-H 'Accept: application/json' \
-H 'Authorization: Bearer <TOKEN>' \
-d '{
  "connection_id": "234423",
  "media_url": "https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf",
  "media_name": "my_media_uploaded_to_media_storage_api",
  "to": "+13127367276",
  "from": "+13125790015",
  "from_display_name": "Company Name",
  "quality": "high",
  "t38_enabled": true,
  "monochrome": false,
  "store_media": false,
  "store_preview": false,
  "preview_format": "tiff",
  "webhook_url": "https://www.example.com/server-b/",
  "client_state": "aGF2ZSBhIG5pY2UgZGF5ID1d"
}'

Response samples

{
  "data": {
    "record_type": "fax",
    "id": "0ccc7b54-4df3-4bca-a65a-3da1ecc777f0",
    "connection_id": "c-1",
    "direction": "outbound",
    "from": "+123",
    "to": "+456",
    "media_url": "http://www.example.com/fax.pdf",
    "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",
    "preview_url": "https://s3.amazonaws.com/faxes-dev/user-1/cf4a6b52-bf8e-4945-9f49-611d0d2b083b_preview.tiff?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",
    "quality": "high",
    "webhook_url": "http://www.example.com/webhooks",
    "webhook_failover_url": "",
    "status": "queued",
    "client_state": "aGF2ZSBhIG5pY2UgZGF5ID1d",
    "created_at": "2020-05-05T09:59:12",
    "updated_at": "2020-05-05T09:59:12"
  }
}