> ## Documentation Index
> Fetch the complete documentation index at: https://guide.omnia-voice.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Place an outbound call

> Have an agent call a number. The agent always waits for the callee to
speak first, regardless of the agent's configured `firstSpeaker` — the
person answering says hello.

Supply the originating number as either `fromNumberId` (preferred) or
`fromNumber` in E.164 form. Exactly one is required.




## OpenAPI

````yaml /openapi.yaml post /calls/outbound
openapi: 3.0.0
info:
  title: Omnia Voice API
  description: >
    The Omnia Voice API allows you to programmatically manage voice agents,
    tools, phone numbers, and call logs.


    ## Authentication

    All API requests require an API key to be passed in the `X-API-Key` header.


    ## Rate Limiting

    API requests are rate limited to 1000 requests per hour per API key.
  version: 1.0.0
  contact:
    email: support@omnia-voice.com
servers:
  - url: https://api.omnia-voice.com/api/v1
    description: Production
  - url: https://dashboard.omnia-voice.com/api/v1
    description: Production (alias — same service)
security:
  - ApiKeyAuth: []
tags:
  - name: Agents
    description: Manage voice agents
  - name: Tools
    description: Manage agent tools and actions
  - name: Phone Numbers
    description: Manage phone number assignments
  - name: Calls
    description: Create and manage voice calls
  - name: Call Logs
    description: View call history and details
  - name: Pricing
    description: Get pricing information and calculate call costs
  - name: Configuration
    description: Get configuration options (voices, languages)
paths:
  /calls/outbound:
    post:
      tags:
        - Calls
      summary: Place an outbound call
      description: |
        Have an agent call a number. The agent always waits for the callee to
        speak first, regardless of the agent's configured `firstSpeaker` — the
        person answering says hello.

        Supply the originating number as either `fromNumberId` (preferred) or
        `fromNumber` in E.164 form. Exactly one is required.
      operationId: createOutboundCall
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - agentId
                - phoneNumber
              properties:
                agentId:
                  type: string
                  description: The agent that will place the call. Must be ACTIVE.
                phoneNumber:
                  type: string
                  description: Destination number in E.164 format.
                  example: '+358401234567'
                fromNumberId:
                  type: string
                  description: ID of one of your numbers to call from.
                fromNumber:
                  type: string
                  description: >-
                    One of your numbers in E.164 form, as an alternative to
                    fromNumberId.
      responses:
        '201':
          description: Call initiated
          headers:
            Location:
              schema:
                type: string
              description: Path of the created call resource.
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                    description: Telephony call SID.
                  sessionId:
                    type: string
                  status:
                    type: string
                  websocketUrl:
                    type: string
                  phoneNumber:
                    type: string
                  fromNumber:
                    type: string
                  agent:
                    type: object
                    properties:
                      id:
                        type: string
                      name:
                        type: string
                      description:
                        type: string
                  createdAt:
                    type: string
                    format: date-time
        '400':
          description: Missing or invalid parameters, or invalid carrier credentials
        '402':
          description: Insufficient credits
        '404':
          description: Agent or originating number not found
        '429':
          description: Rate limit exceeded
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
      description: API key for authentication

````