openapi: 3.1.0
info:
  contact:
    email: support@telnyx.com
  description: Telnyx provides global communications and connectivity APIs for developers — including SIP trunking, programmable voice, SMS, MMS, WhatsApp Business Messaging, Call Control, Fax, Wireless (IoT & eSIM), Phone Numbers (DID provisioning & porting), Emergency Services, and Network APIs for private interconnects and edge connectivity. Build, scale, and manage voice, messaging, and data networks with Telnyx's carrier-grade global infrastructure and API-first platform.
  title: Telnyx Access Tokens Programmable Fax Applications API
  version: 2.0.0
  x-endpoint-cost: light
servers:
- description: Version 2.0.0 of the Telnyx API
  url: https://api.telnyx.com/v2
security:
- bearerAuth: []
tags:
- description: Fax Applications operations
  name: Programmable Fax Applications
paths:
  /fax_applications:
    get:
      description: This endpoint returns a list of your Fax Applications inside the 'data' attribute of the response. You can adjust which applications are listed by using filters. Fax Applications are used to configure how you send and receive faxes using the Programmable Fax API with Telnyx.
      operationId: ListFaxApplications
      parameters:
      - $ref: '#/components/parameters/PageConsolidated'
      - $ref: '#/components/parameters/programmable-fax_FilterConsolidated'
      - $ref: '#/components/parameters/programmable-fax_SortApplication'
      responses:
        '200':
          $ref: '#/components/responses/GetAllFaxApplicationsResponse'
        '400':
          $ref: '#/components/responses/programmable-fax_BadRequestResponse'
        '401':
          $ref: '#/components/responses/UnauthenticatedResponse'
        '403':
          $ref: '#/components/responses/programmable-fax_UnauthorizedResponse'
      summary: List all Fax Applications
      tags:
      - Programmable Fax Applications
      x-endpoint-cost: medium
      x-latency-category: responsive
    post:
      description: Creates a new Fax Application based on the parameters sent in the request. The application name and webhook URL are required. Once created, you can assign phone numbers to your application using the `/phone_numbers` endpoint.
      operationId: CreateFaxApplication
      parameters: []
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateFaxApplicationRequest'
        description: Parameters that can be set when creating a Fax Application
        required: true
      responses:
        '201':
          $ref: '#/components/responses/FaxApplicationResponse'
        '401':
          $ref: '#/components/responses/UnauthenticatedResponse'
        '403':
          $ref: '#/components/responses/programmable-fax_UnauthorizedResponse'
        '422':
          $ref: '#/components/responses/programmable-fax_UnprocessableEntityResponse'
      summary: Creates a Fax Application
      tags:
      - Programmable Fax Applications
      x-endpoint-cost: medium
      x-latency-category: responsive
  /fax_applications/{id}:
    delete:
      description: Permanently deletes a Fax Application. Deletion may be prevented if the application is in use by phone numbers.
      operationId: DeleteFaxApplication
      parameters:
      - $ref: '#/components/parameters/id'
      responses:
        '200':
          $ref: '#/components/responses/FaxApplicationResponse'
        '400':
          $ref: '#/components/responses/programmable-fax_BadRequestResponse'
        '401':
          $ref: '#/components/responses/UnauthenticatedResponse'
        '403':
          $ref: '#/components/responses/programmable-fax_UnauthorizedResponse'
        '404':
          $ref: '#/components/responses/programmable-fax_NotFoundResponse'
      summary: Deletes a Fax Application
      tags:
      - Programmable Fax Applications
      x-latency-category: responsive
    get:
      description: Return the details of an existing Fax Application inside the 'data' attribute of the response.
      operationId: GetFaxApplication
      parameters:
      - $ref: '#/components/parameters/id'
      responses:
        '200':
          $ref: '#/components/responses/FaxApplicationResponse'
        '400':
          $ref: '#/components/responses/programmable-fax_BadRequestResponse'
        '401':
          $ref: '#/components/responses/UnauthenticatedResponse'
        '403':
          $ref: '#/components/responses/programmable-fax_UnauthorizedResponse'
        '404':
          $ref: '#/components/responses/programmable-fax_NotFoundResponse'
      summary: Retrieve a Fax Application
      tags:
      - Programmable Fax Applications
      x-latency-category: responsive
    patch:
      description: Updates settings of an existing Fax Application based on the parameters of the request.
      operationId: UpdateFaxApplication
      parameters:
      - $ref: '#/components/parameters/id'
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UpdateFaxApplicationRequest'
        description: Parameters to be updated for the Fax Application
        required: true
      responses:
        '200':
          $ref: '#/components/responses/FaxApplicationResponse'
        '401':
          $ref: '#/components/responses/UnauthenticatedResponse'
        '403':
          $ref: '#/components/responses/programmable-fax_UnauthorizedResponse'
        '404':
          $ref: '#/components/responses/programmable-fax_NotFoundResponse'
        '422':
          $ref: '#/components/responses/programmable-fax_UnprocessableEntityResponse'
      summary: Update a Fax Application
      tags:
      - Programmable Fax Applications
      x-latency-category: responsive
components:
  responses:
    GetAllFaxApplicationsResponse:
      content:
        application/json:
          schema:
            properties:
              data:
                items:
                  $ref: '#/components/schemas/FaxApplication'
                type: array
              meta:
                $ref: '#/components/schemas/PaginationMeta'
            title: Get All Fax Applications Response
            type: object
      description: Successful response
    FaxApplicationResponse:
      content:
        application/json:
          schema:
            properties:
              data:
                $ref: '#/components/schemas/FaxApplication'
            title: Fax Application Response
            type: object
      description: Successful response
    UnauthenticatedResponse:
      content:
        application/json:
          examples:
            Authentication Failed:
              value:
                errors:
                - code: '10009'
                  detail: Could not understand the provided credentials.
                  meta:
                    url: https://developers.telnyx.com/docs/overview/errors/10009
                  title: Authentication failed
          schema:
            $ref: '#/components/schemas/ErrorResponse'
      description: Unauthorized
    programmable-fax_BadRequestResponse:
      content:
        application/json:
          examples:
            missingParameter:
              value:
                errors:
                - code: '10015'
                  detail: The request failed because it was not well-formed.
                  meta:
                    url: https://developers.telnyx.com/docs/overview/errors/10015
                  source:
                    pointer: /
                  title: Bad Request
          schema:
            $ref: '#/components/schemas/ErrorResponse'
      description: Bad request, the request was unacceptable, often due to missing a required parameter.
    programmable-fax_UnauthorizedResponse:
      description: Unauthorized
    programmable-fax_NotFoundResponse:
      content:
        application/json:
          example:
            errors:
            - code: '404'
              detail: The requested resource does not exist
              title: Not Found
          schema:
            $ref: '#/components/schemas/programmable-fax_Errors'
      description: The requested resource does not exist
    programmable-fax_UnprocessableEntityResponse:
      content:
        application/json:
          example:
            errors:
            - code: '422'
              detail: The request parameters failed validation
              title: Unprocessable Entity
          schema:
            $ref: '#/components/schemas/programmable-fax_Errors'
      description: Unprocessable entity. The request was well-formed but contains semantic errors.
  schemas:
    FaxEmailRecipient:
      default: null
      description: Specifies an email address where faxes sent to this application will be forwarded to (as pdf or tiff attachments)
      example: user@example.com
      title: Fax Email Recipient
      type:
      - string
      - 'null'
    ApplicationName:
      description: A user-assigned name to help manage the application.
      example: call-router
      title: Application Name
      type: string
    OutboundVoiceProfileId:
      description: Identifies the associated outbound voice profile.
      example: '1293384261075731499'
      title: Outbound Voice Profile ID
      type: string
    CreateFaxApplicationRequest:
      example:
        active: false
        anchorsite_override: Amsterdam, Netherlands
        application_name: fax-router
        inbound:
          channel_limit: 10
          sip_subdomain: example
          sip_subdomain_receive_settings: only_my_connections
        outbound:
          channel_limit: 10
          outbound_voice_profile_id: '1293384261075731499'
        tags:
        - tag1
        - tag2
        webhook_event_failover_url: https://failover.example.com
        webhook_event_url: https://example.com
        webhook_timeout_secs: 25
      properties:
        active:
          $ref: '#/components/schemas/ConnectionActive'
        anchorsite_override:
          $ref: '#/components/schemas/AnchorsiteOverride'
        application_name:
          $ref: '#/components/schemas/ApplicationName'
        inbound:
          properties:
            channel_limit:
              default: null
              description: When set, this will limit the number of concurrent inbound calls to phone numbers associated with this connection.
              example: 10
              type: integer
            sip_subdomain:
              default: null
              description: 'Specifies a subdomain that can be used to receive Inbound calls to a Connection, in the same way a phone number is used, from a SIP endpoint. Example: the subdomain "example.sip.telnyx.com" can be called from any SIP endpoint by using the SIP URI "sip:@example.sip.telnyx.com" where the user part can be any alphanumeric value. Please note TLS encrypted calls are not allowed for subdomain calls.'
              example: example
              type: string
            sip_subdomain_receive_settings:
              default: from_anyone
              description: 'This option can be enabled to receive calls from: "Anyone" (any SIP endpoint in the public Internet) or "Only my connections" (any connection assigned to the same Telnyx user).'
              enum:
              - only_my_connections
              - from_anyone
              example: only_my_connections
              type: string
          type: object
        outbound:
          properties:
            channel_limit:
              default: null
              description: When set, this will limit the number of concurrent outbound calls to phone numbers associated with this connection.
              example: 10
              type: integer
            outbound_voice_profile_id:
              $ref: '#/components/schemas/OutboundVoiceProfileId'
          type: object
        tags:
          default: []
          description: Tags associated with the Fax Application.
          example:
          - tag1
          - tag2
          items:
            type: string
          type: array
        webhook_event_failover_url:
          $ref: '#/components/schemas/WebhookEventFailoverUrl'
        webhook_event_url:
          $ref: '#/components/schemas/WebhookEventUrl'
        webhook_timeout_secs:
          $ref: '#/components/schemas/WebhookTimeoutSecs'
      required:
      - application_name
      - webhook_event_url
      title: Create Fax Application Request
      type: object
    ConnectionActive:
      default: true
      description: Specifies whether the connection can be used.
      example: false
      title: Connection Active
      type: boolean
    ErrorResponse:
      properties:
        errors:
          items:
            properties:
              code:
                type: string
              detail:
                type: string
              meta:
                properties:
                  url:
                    format: uri
                    type: string
                type: object
              source:
                properties:
                  pointer:
                    type: string
                type: object
              title:
                type: string
            type: object
          type: array
      type: object
    WebhookEventUrl:
      description: The URL where webhooks related to this connection will be sent. Must include a scheme, such as 'https'.
      example: https://example.com
      format: uri
      title: Webhook Event URL
      type: string
    FaxApplication:
      example:
        active: false
        anchorsite_override: Amsterdam, Netherlands
        application_name: fax-router
        created_at: '2018-02-02T22:25:27.521Z'
        id: '1293384261075731499'
        inbound:
          channel_limit: 10
          sip_subdomain: example
          sip_subdomain_receive_settings: only_my_connections
        outbound:
          channel_limit: 10
          outbound_voice_profile_id: '1293384261075731499'
        record_type: fax_application
        updated_at: '2018-02-02T22:25:27.521Z'
        webhook_event_failover_url: https://failover.example.com
        webhook_event_url: https://example.com
        webhook_timeout_secs: 25
      properties:
        active:
          $ref: '#/components/schemas/ConnectionActive'
        anchorsite_override:
          $ref: '#/components/schemas/AnchorsiteOverride'
        application_name:
          $ref: '#/components/schemas/ApplicationName'
        created_at:
          description: ISO 8601 formatted date indicating when the resource was created.
          example: '2018-02-02T22:25:27.521Z'
          type: string
        id:
          $ref: '#/components/schemas/IntId'
        inbound:
          properties:
            channel_limit:
              default: null
              description: When set, this will limit the number of concurrent inbound calls to phone numbers associated with this connection.
              example: 10
              type: integer
            sip_subdomain:
              default: null
              description: 'Specifies a subdomain that can be used to receive Inbound calls to a Connection, in the same way a phone number is used, from a SIP endpoint. Example: the subdomain "example.sip.telnyx.com" can be called from any SIP endpoint by using the SIP URI "sip:@example.sip.telnyx.com" where the user part can be any alphanumeric value. Please note TLS encrypted calls are not allowed for subdomain calls.'
              example: example
              type: string
            sip_subdomain_receive_settings:
              default: from_anyone
              description: 'This option can be enabled to receive calls from: "Anyone" (any SIP endpoint in the public Internet) or "Only my connections" (any connection assigned to the same Telnyx user).'
              enum:
              - only_my_connections
              - from_anyone
              example: only_my_connections
              type: string
          type: object
        outbound:
          properties:
            channel_limit:
              default: null
              description: When set, this will limit the number of concurrent outbound calls to phone numbers associated with this connection.
              example: 10
              type: integer
            outbound_voice_profile_id:
              $ref: '#/components/schemas/OutboundVoiceProfileId'
          type: object
        record_type:
          description: Identifies the type of the resource.
          example: fax_application
          type: string
        tags:
          default: []
          description: Tags associated with the Fax Application.
          example:
          - tag1
          - tag2
          items:
            type: string
          type: array
        updated_at:
          description: ISO 8601 formatted date indicating when the resource was updated.
          example: '2018-02-02T22:25:27.521Z'
          type: string
        webhook_event_failover_url:
          $ref: '#/components/schemas/WebhookEventFailoverUrl'
        webhook_event_url:
          $ref: '#/components/schemas/WebhookEventUrl'
        webhook_timeout_secs:
          $ref: '#/components/schemas/WebhookTimeoutSecs'
      title: Fax Application
      type: object
    programmable-fax_Error:
      properties:
        code:
          type: string
        detail:
          type: string
        meta:
          additionalProperties: true
          type: object
        source:
          properties:
            parameter:
              description: Indicates which query parameter caused the error.
              type: string
            pointer:
              description: JSON pointer (RFC6901) to the offending entity.
              type: string
          type: object
        title:
          type: string
      required:
      - code
      - title
      type: object
    AnchorsiteOverride:
      default: Latency
      description: '`Latency` directs Telnyx to route media through the site with the lowest round-trip time to the user''s connection. Telnyx calculates this time using ICMP ping messages. This can be disabled by specifying a site to handle all media.'
      enum:
      - Latency
      - Chicago, IL
      - Ashburn, VA
      - San Jose, CA
      - Sydney, Australia
      - Amsterdam, Netherlands
      - London, UK
      - Toronto, Canada
      - Vancouver, Canada
      - Frankfurt, Germany
      example: Amsterdam, Netherlands
      title: Anchorsite Override
      type: string
    UpdateFaxApplicationRequest:
      example:
        active: false
        anchorsite_override: Amsterdam, Netherlands
        application_name: fax-router
        inbound:
          channel_limit: 10
          sip_subdomain: example
          sip_subdomain_receive_settings: only_my_connections
        outbound:
          channel_limit: 10
          outbound_voice_profile_id: '1293384261075731499'
        tags:
        - tag1
        - tag2
        webhook_event_failover_url: https://failover.example.com
        webhook_event_url: https://example.com
        webhook_timeout_secs: 25
      properties:
        active:
          $ref: '#/components/schemas/ConnectionActive'
        anchorsite_override:
          $ref: '#/components/schemas/AnchorsiteOverride'
        application_name:
          $ref: '#/components/schemas/ApplicationName'
        fax_email_recipient:
          $ref: '#/components/schemas/FaxEmailRecipient'
        inbound:
          properties:
            channel_limit:
              default: null
              description: When set, this will limit the number of concurrent inbound calls to phone numbers associated with this connection.
              example: 10
              type: integer
            sip_subdomain:
              default: null
              description: 'Specifies a subdomain that can be used to receive Inbound calls to a Connection, in the same way a phone number is used, from a SIP endpoint. Example: the subdomain "example.sip.telnyx.com" can be called from any SIP endpoint by using the SIP URI "sip:@example.sip.telnyx.com" where the user part can be any alphanumeric value. Please note TLS encrypted calls are not allowed for subdomain calls.'
              example: example
              type: string
            sip_subdomain_receive_settings:
              default: from_anyone
              description: 'This option can be enabled to receive calls from: "Anyone" (any SIP endpoint in the public Internet) or "Only my connections" (any connection assigned to the same Telnyx user).'
              enum:
              - only_my_connections
              - from_anyone
              example: only_my_connections
              type: string
          type: object
        outbound:
          properties:
            channel_limit:
              default: null
              description: When set, this will limit the number of concurrent outbound calls to phone numbers associated with this connection.
              example: 10
              type: integer
            outbound_voice_profile_id:
              $ref: '#/components/schemas/OutboundVoiceProfileId'
          type: object
        tags:
          description: Tags associated with the Fax Application.
          example:
          - tag1
          - tag2
          items:
            type: string
          type: array
        webhook_event_failover_url:
          $ref: '#/components/schemas/WebhookEventFailoverUrl'
        webhook_event_url:
          $ref: '#/components/schemas/WebhookEventUrl'
        webhook_timeout_secs:
          $ref: '#/components/schemas/WebhookTimeoutSecs'
      required:
      - application_name
      - webhook_event_url
      title: Update Fax Application Request
      type: object
    WebhookEventFailoverUrl:
      default: ''
      description: The failover URL where webhooks related to this connection will be sent if sending to the primary URL fails. Must include a scheme, such as 'https'.
      example: https://failover.example.com
      format: uri
      title: Webhook Event Failover URL
      type:
      - string
      - 'null'
    IntId:
      description: Uniquely identifies the resource.
      example: '1293384261075731499'
      title: Int ID
      type: string
    PaginationMeta:
      properties:
        page_number:
          example: 2
          type: integer
        page_size:
          example: 25
          type: integer
        total_pages:
          example: 3
          type: integer
        total_results:
          example: 55
          type: integer
      type: object
    WebhookTimeoutSecs:
      default: null
      description: Specifies how many seconds to wait before timing out a webhook.
      example: 25
      maximum: 30
      minimum: 0
      title: Webhook Timeout Secs
      type:
      - integer
      - 'null'
    programmable-fax_Errors:
      properties:
        errors:
          items:
            $ref: '#/components/schemas/programmable-fax_Error'
          type: array
      type: object
  parameters:
    programmable-fax_FilterConsolidated:
      description: 'Consolidated filter parameter (deepObject style). Originally: filter[application_name][contains], filter[outbound_voice_profile_id]'
      explode: true
      in: query
      name: filter
      schema:
        properties:
          application_name:
            description: Application name filtering operations
            properties:
              contains:
                description: If present, applications with <code>application_name</code> containing the given value will be returned. Matching is not case-sensitive. Requires at least three characters.
                example: fax-app
                type: string
            type: object
          outbound_voice_profile_id:
            description: Identifies the associated outbound voice profile.
            example: '1293384261075731499'
            type: string
        type: object
      style: deepObject
    PageConsolidated:
      description: 'Consolidated page parameter (deepObject style). Originally: page[number], page[size]'
      explode: true
      in: query
      name: page
      schema:
        properties:
          number:
            default: 1
            description: The page number to load
            minimum: 1
            type: integer
          size:
            default: 20
            description: The size of the page
            maximum: 250
            minimum: 1
            type: integer
        type: object
      style: deepObject
    id:
      description: Identifies the resource.
      in: path
      name: id
      required: true
      schema:
        example: '1293384261075731499'
        type: string
    programmable-fax_SortApplication:
      description: "Specifies the sort order for results. By default sorting direction is ascending. To have the results sorted in descending order add the <code> -</code> prefix.<br/><br/>\nThat is: <ul>\n  <li>\n    <code>application_name</code>: sorts the result by the\n    <code>application_name</code> field in ascending order.\n  </li>\n\n  <li>\n    <code>-application_name</code>: sorts the result by the\n    <code>application_name</code> field in descending order.\n  </li>\n</ul> <br/> If not given, results are sorted by <code>created_at</code> in descending order."
      in: query
      name: sort
      schema:
        default: created_at
        enum:
        - created_at
        - application_name
        - active
        example: application_name
        type: string
  securitySchemes:
    bearerAuth:
      scheme: bearer
      type: http
    branded-calling_bearerAuth:
      description: API key passed as a Bearer token in the Authorization header
      scheme: bearer
      type: http
    oauthClientAuth:
      description: OAuth 2.0 authentication for Telnyx API and MCP integrations
      flows:
        authorizationCode:
          authorizationUrl: https://api.telnyx.com/v2/oauth/authorize
          refreshUrl: https://api.telnyx.com/v2/oauth/token
          scopes:
            admin: Administrative access to Telnyx resources
          tokenUrl: https://api.telnyx.com/v2/oauth/token
        clientCredentials:
          scopes:
            admin: Administrative access to Telnyx resources
          tokenUrl: https://api.telnyx.com/v2/oauth/token
      type: oauth2
    outbound-voice-profiles_bearerAuth:
      bearerFormat: JWT
      scheme: bearer
      type: http
    pronunciation-dicts_bearerAuth:
      description: Telnyx API v2 key. Obtain from https://portal.telnyx.com
      scheme: bearer
      type: http
    stored-payment-transactions_bearerAuth:
      bearerFormat: JWT
      scheme: bearer
      type: http