openapi: 3.0.3
info:
  title: Kaleyra CPaaS Messages Voice API
  description: Kaleyra (a Tata Communications company) omnichannel CPaaS REST API for SMS, WhatsApp, RCS, Voice, and Verify (OTP), plus the Kaleyra Video REST API. Requests authenticate with the `api-key` header and address an account by its SID in the URL path. Regional hosts serve India, APAC/SEA, and EU data residency.
  termsOfService: https://www.kaleyra.com/terms-conditions/
  contact:
    name: Kaleyra Support
    url: https://support.kaleyra.com/
  version: '2.0'
servers:
- url: https://api.kaleyra.io
  description: Default / global host
- url: https://api.in.kaleyra.io
  description: India region (data residency)
- url: https://api.ap.kaleyra.io
  description: APAC / South East Asia region
- url: https://api.eu.kaleyra.io
  description: Europe region
security:
- apiKeyAuth: []
tags:
- name: Voice
  description: Click-to-call and outbound voice.
paths:
  /v1/{sid}/voice/click-to-call:
    post:
      operationId: clickToCall
      tags:
      - Voice
      summary: Initiate a click-to-call bridged voice call
      description: Places an outbound call to `from`, then dials `to` and bridges the two legs over the caller ID / bridge number.
      parameters:
      - $ref: '#/components/parameters/Sid'
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              $ref: '#/components/schemas/ClickToCallRequest'
      responses:
        '200':
          description: Call initiated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VoiceResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    VoiceResponse:
      type: object
      properties:
        id:
          type: string
        status:
          type: string
    Error:
      type: object
      properties:
        error:
          type: string
        message:
          type: string
    ClickToCallRequest:
      type: object
      required:
      - from
      - to
      properties:
        from:
          type: string
          description: First leg number (called first).
        to:
          type: string
          description: Second leg number, bridged after the first answers.
        caller_id:
          type: string
        callback_url:
          type: string
          format: uri
  parameters:
    Sid:
      name: sid
      in: path
      required: true
      description: Account SID (Security Identifier) issued by kaleyra.io.
      schema:
        type: string
  responses:
    Unauthorized:
      description: Missing or invalid api-key header.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: api-key
      description: API key generated in the kaleyra.io console (e.g. "Ac4XXXXX21f").