> ## Documentation Index > Fetch the complete documentation index at: https://developers.telnyx.com/llms.txt > Use this file to discover all available pages before exploring further. # Send a fax > 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` ## OpenAPI ````yaml https://telnyx-openapi-ng.s3.us-east-1.amazonaws.com/real-time-communications/fax.yml post /faxes openapi: 3.1.0 info: title: Telnyx Fax API version: 2.0.0 description: API for Fax. contact: email: support@telnyx.com servers: - url: https://api.telnyx.com/v2 security: - bearerAuth: [] paths: /faxes: post: tags: - Programmable Fax Commands summary: Send a fax description: > 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` operationId: SendFax requestBody: description: Send fax request required: true content: application/json: schema: $ref: '#/components/schemas/SendFaxRequest' multipart/form-data: schema: $ref: '#/components/schemas/SendFaxMultipartRequest' responses: '202': $ref: '#/components/responses/SendFaxResponse' '422': $ref: '#/components/responses/programmable-fax_UnprocessableEntityResponse' default: $ref: '#/components/responses/programmable-fax_GenericErrorResponse' x-codeSamples: - lang: JavaScript source: |- import Telnyx from 'telnyx'; const client = new Telnyx({ apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted }); const fax = await client.faxes.create({ connection_id: '234423', from: '+13125790015', to: '+13127367276', }); console.log(fax.data); - lang: Python source: |- import os from telnyx import Telnyx client = Telnyx( api_key=os.environ.get("TELNYX_API_KEY"), # This is the default and can be omitted ) fax = client.faxes.create( connection_id="234423", from_="+13125790015", to="+13127367276", ) print(fax.data) - lang: Go source: "package main\n\nimport (\n\t\"context\"\n\t\"fmt\"\n\n\t\"github.com/team-telnyx/telnyx-go\"\n\t\"github.com/team-telnyx/telnyx-go/option\"\n)\n\nfunc main() {\n\tclient := telnyx.NewClient(\n\t\toption.WithAPIKey(\"My API Key\"),\n\t)\n\tfax, err := client.Faxes.New(context.TODO(), telnyx.FaxNewParams{\n\t\tConnectionID: \"234423\",\n\t\tFrom: \"+13125790015\",\n\t\tTo: \"+13127367276\",\n\t})\n\tif err != nil {\n\t\tpanic(err.Error())\n\t}\n\tfmt.Printf(\"%+v\\n\", fax.Data)\n}\n" - lang: Java source: |- package com.telnyx.sdk.example; import com.telnyx.sdk.client.TelnyxClient; import com.telnyx.sdk.client.okhttp.TelnyxOkHttpClient; import com.telnyx.sdk.models.faxes.FaxCreateParams; import com.telnyx.sdk.models.faxes.FaxCreateResponse; public final class Main { private Main() {} public static void main(String[] args) { TelnyxClient client = TelnyxOkHttpClient.fromEnv(); FaxCreateParams params = FaxCreateParams.builder() .connectionId("234423") .from("+13125790015") .to("+13127367276") .build(); FaxCreateResponse fax = client.faxes().create(params); } } - lang: Ruby source: >- require "telnyx" telnyx = Telnyx::Client.new(api_key: "My API Key") fax = telnyx.faxes.create(connection_id: "234423", from: "+13125790015", to: "+13127367276") puts(fax) - lang: CLI source: |- telnyx faxes create \ --api-key 'My API Key' \ --connection-id 234423 \ --from +13125790015 \ --to +13127367276 components: schemas: SendFaxRequest: type: object title: Send fax request required: - connection_id - from - to properties: connection_id: description: The connection ID to send the fax with. type: string example: '234423' media_url: $ref: '#/components/schemas/MediaUrl' media_name: $ref: '#/components/schemas/MediaName' to: $ref: '#/components/schemas/To' from: $ref: '#/components/schemas/From' from_display_name: description: >- 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. type: string example: Company Name quality: $ref: '#/components/schemas/Quality' t38_enabled: description: The flag to disable the T.38 protocol. type: boolean default: true monochrome: description: The flag to enable monochrome, true black and white fax results. type: boolean default: false black_threshold: description: >- The black threshold percentage for monochrome faxes. Only applicable if `monochrome` is set to `true`. type: integer minimum: 1 maximum: 100 default: 95 store_media: description: >- Should fax media be stored on temporary URL. It does not support media_name, they can't be submitted together. type: boolean default: false store_preview: description: Should fax preview be stored on temporary URL. type: boolean default: false preview_format: description: >- The format for the preview file in case the `store_preview` is `true`. type: string enum: - pdf - tiff default: tiff webhook_url: description: >- Use this field to override the URL to which Telnyx will send subsequent webhooks for this fax. type: string example: https://www.example.com/server-b/ client_state: description: >- Use this field to add state to every subsequent webhook. It must be a valid Base-64 encoded string. type: string example: aGF2ZSBhIG5pY2UgZGF5ID1d SendFaxMultipartRequest: type: object title: Send fax multipart request required: - connection_id - contents - from - to properties: connection_id: $ref: '#/components/schemas/ConnectionId' contents: description: >- The file you want to upload. The maximum allowed size is 20 MB. contents and media_name/media_url can't be submitted together. type: string format: binary to: $ref: '#/components/schemas/To' from: $ref: '#/components/schemas/From' quality: $ref: '#/components/schemas/Quality' t38_enabled: $ref: '#/components/schemas/T38Enabled' monochrome: $ref: '#/components/schemas/Monochrome' store_media: $ref: '#/components/schemas/StoreMedia' store_preview: $ref: '#/components/schemas/StorePreview' MediaUrl: description: >- 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. type: string example: https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf MediaName: description: >- 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. type: string example: my_media_uploaded_to_media_storage_api To: description: The phone number, in E.164 format, the fax will be sent to or SIP URI type: string example: '+13127367276' From: description: The phone number, in E.164 format, the fax will be sent from. type: string example: '+13125790015' Quality: description: >- 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. type: string example: high default: high enum: - normal - high - very_high - ultra_light - ultra_dark ConnectionId: description: The ID of the connection used to send the fax. type: string example: '234423' T38Enabled: description: The flag to disable the T.38 protocol. type: boolean default: true Monochrome: description: The flag to enable monochrome, true black and white fax results. type: boolean default: false StoreMedia: description: >- Should fax media be stored on temporary URL. It does not support media_name, they can't be submitted together. type: boolean default: false StorePreview: description: Should fax preview be stored on temporary URL. type: boolean default: false Fax: type: object properties: record_type: description: Identifies the type of the resource. type: string example: fax enum: - fax id: $ref: '#/components/schemas/Id' connection_id: $ref: '#/components/schemas/ConnectionId' direction: $ref: '#/components/schemas/Direction' media_url: $ref: '#/components/schemas/MediaUrl' media_name: $ref: '#/components/schemas/MediaName' to: $ref: '#/components/schemas/To' from: $ref: '#/components/schemas/From' from_display_name: description: >- The string used as the caller id name (SIP From Display Name) presented to the destination (`to` number). type: string example: Company Name quality: $ref: '#/components/schemas/Quality' status: description: Status of the fax type: string example: queued enum: - queued - media.processed - originated - sending - delivered - failed - initiated - receiving - media.processing - received webhook_url: description: URL that will receive fax webhooks type: string webhook_failover_url: description: >- Optional failover URL that will receive fax webhooks if webhook_url doesn't return a 2XX response type: string store_media: description: >- Should fax media be stored on temporary URL. It does not support media_name. type: boolean stored_media_url: description: >- If store_media was set to true, this is a link to temporary location. Link expires after 10 minutes. type: string preview_url: description: >- If `store_preview` was set to `true`, this is a link to temporary location. Link expires after 10 minutes. type: string client_state: description: State received from a command. type: string example: aGF2ZSBhIG5pY2UgZGF5ID1d created_at: description: ISO 8601 timestamp when resource was created type: string format: date-time updated_at: description: ISO 8601 timestamp when resource was updated type: string format: date-time example: 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: '2020-05-05T09:59:12Z' updated_at: '2020-05-05T09:59:12Z' programmable-fax_Errors: properties: errors: type: array items: $ref: '#/components/schemas/programmable-fax_Error' type: object Id: type: string format: uuid example: 0ccc7b54-4df3-4bca-a65a-3da1ecc777f0 description: Identifies the type of resource. Direction: description: The direction of the fax. type: string example: outbound enum: - inbound - outbound programmable-fax_Error: required: - code - title properties: code: type: string title: type: string detail: type: string source: type: object properties: pointer: description: JSON pointer (RFC6901) to the offending entity. type: string parameter: description: Indicates which query parameter caused the error. type: string meta: type: object additionalProperties: true type: object responses: SendFaxResponse: description: Send fax response content: application/json: schema: type: object title: Send Fax Response properties: data: $ref: '#/components/schemas/Fax' programmable-fax_UnprocessableEntityResponse: description: >- Unprocessable entity. The request was well-formed but contains semantic errors. content: application/json: schema: $ref: '#/components/schemas/programmable-fax_Errors' example: errors: - code: '422' title: Unprocessable Entity detail: The request parameters failed validation programmable-fax_GenericErrorResponse: description: Unexpected error content: application/json: schema: $ref: '#/components/schemas/programmable-fax_Errors' securitySchemes: bearerAuth: scheme: bearer type: http ````