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

# Initiate Outbound Call

> Initiate an outbound call from an agent.



## OpenAPI

````yaml https://api.mrassistant.ai/openapi.json post /calls/outbound
openapi: 3.1.0
info:
  title: Backend - Multilingual Voice Agent System
  description: FastAPI backend for multilingual voice agents with tool use
  version: 1.0.0
servers: []
security: []
paths:
  /calls/outbound:
    post:
      tags:
        - calls
      summary: Initiate Outbound Call
      description: Initiate an outbound call from an agent.
      operationId: initiate_outbound_call_calls_outbound_post
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/OutboundCallRequest'
        required: true
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CallResponse'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
      security:
        - HTTPBearer: []
components:
  schemas:
    OutboundCallRequest:
      properties:
        agent_id:
          type: string
          format: uuid
          title: Agent Id
        to_number:
          type: string
          title: To Number
          description: Destination phone number (E.164 format, spaces auto-stripped)
        from_number:
          anyOf:
            - type: string
            - type: 'null'
          title: From Number
          description: Caller ID (E.164 format, spaces auto-stripped)
        context:
          anyOf:
            - additionalProperties: true
              type: object
            - type: 'null'
          title: Context
          description: Additional call context/metadata
        priority:
          type: string
          pattern: ^(low|normal|high|urgent)$
          title: Priority
          description: Call priority level
          default: normal
        krisp_enabled:
          type: boolean
          title: Krisp Enabled
          description: Enable Krisp noise cancellation for this call
          default: true
        wait_until_answered:
          type: boolean
          title: Wait Until Answered
          description: Wait for call to be answered before returning
          default: false
        display_name:
          anyOf:
            - type: string
            - type: 'null'
          title: Display Name
          description: Custom caller ID display name
        dtmf:
          anyOf:
            - type: string
            - type: 'null'
          title: Dtmf
          description: DTMF tones to send after call connects (e.g., '*123#ww456')
        play_dialtone:
          type: boolean
          title: Play Dialtone
          description: Play dial tone while call is connecting
          default: false
        media_encryption:
          type: string
          pattern: ^(DISABLE|ALLOW|REQUIRE)$
          title: Media Encryption
          description: Media encryption level
          default: ALLOW
        ringing_timeout_seconds:
          type: integer
          maximum: 80
          minimum: 1
          title: Ringing Timeout Seconds
          description: Max time to wait for answer (1-80 seconds)
          default: 80
        max_call_duration_seconds:
          type: integer
          maximum: 86400
          minimum: 60
          title: Max Call Duration Seconds
          description: Maximum call duration
          default: 3600
        hide_phone_number:
          type: boolean
          title: Hide Phone Number
          description: Hide phone number from participant attributes
          default: false
        custom_headers:
          anyOf:
            - additionalProperties:
                type: string
              type: object
            - type: 'null'
          title: Custom Headers
          description: Custom SIP X-* headers
      type: object
      required:
        - agent_id
        - to_number
      title: OutboundCallRequest
      description: Outbound call request model with full LiveKit SIP support.
    CallResponse:
      properties:
        call_id:
          type: string
          format: uuid
          title: Call Id
        session_id:
          type: string
          format: uuid
          title: Session Id
        room_name:
          type: string
          title: Room Name
        agent_id:
          type: string
          format: uuid
          title: Agent Id
        direction:
          type: string
          title: Direction
        from_number:
          type: string
          title: From Number
        to_number:
          type: string
          title: To Number
        status:
          type: string
          title: Status
        recording:
          anyOf:
            - additionalProperties: true
              type: object
            - type: 'null'
          title: Recording
      type: object
      required:
        - call_id
        - session_id
        - room_name
        - agent_id
        - direction
        - from_number
        - to_number
        - status
      title: CallResponse
      description: Call response model.
    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:
    HTTPBearer:
      type: http
      scheme: bearer

````