> ## Documentation Index
> Fetch the complete documentation index at: https://docs.threetone.in/llms.txt
> Use this file to discover all available pages before exploring further.

# Initiate An Outbound Call

> Initiate a single outbound call to a phone number using an agent.



## OpenAPI

````yaml https://api.threetone.in/openapi.json post /v1/voiceai/outbound-call
openapi: 3.1.0
info:
  title: Threetone API Documentation
  version: 1.0.0
servers:
  - url: https://api.threetone.in
    description: Production
security: []
paths:
  /v1/voiceai/outbound-call:
    post:
      tags:
        - Outbound Calls
      summary: Initiate An Outbound Call
      description: Initiate a single outbound call to a phone number using an agent.
      operationId: initiate_outbound_call
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/OutboundCallRequest'
        required: true
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/OutboundCallResponse'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
      security:
        - APIKeyHeader: []
        - HTTPBearer: []
components:
  schemas:
    OutboundCallRequest:
      properties:
        agent_id:
          type: string
          title: Agent Id
          description: Agent ID to use for the call
        phone_number_id:
          type: string
          title: Phone Number Id
          description: Phone number ID to call from
        to_phone_number:
          type: string
          title: To Phone Number
          description: Phone number to call (E.164 format)
        dynamic_variables:
          anyOf:
            - additionalProperties: true
              type: object
            - type: 'null'
          title: Dynamic Variables
          description: Dynamic variables to pass to the agent
      type: object
      required:
        - agent_id
        - phone_number_id
        - to_phone_number
      title: OutboundCallRequest
      description: Request to initiate an outbound call.
    OutboundCallResponse:
      properties:
        success:
          type: boolean
          title: Success
          description: Whether the call was initiated successfully
        message:
          type: string
          title: Message
          description: Status message
          default: Success
        conversation_id:
          type: string
          title: Conversation Id
          description: Generated conversation ID
        call_sid:
          anyOf:
            - type: string
            - type: 'null'
          title: Call Sid
          description: SIP call ID if available
      type: object
      required:
        - success
        - conversation_id
      title: OutboundCallResponse
      description: Response from initiating an outbound call.
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
              - type: string
              - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
        input:
          title: Input
        ctx:
          type: object
          title: Context
      type: object
      required:
        - loc
        - msg
        - type
      title: ValidationError
  securitySchemes:
    APIKeyHeader:
      type: apiKey
      description: API key for programmatic access
      in: header
      name: x-api-key
    HTTPBearer:
      type: http
      description: JWT Bearer token for dashboard access
      scheme: bearer

````