---
title: "Initiate Outbound Call"
method: POST
path: "/api/v1/calls/initiate"
tags: ["Call Management"]
---

# Initiate Outbound Call

`POST /api/v1/calls/initiate`

## Request

- The document declares no server URL.
- Auth: none declared

Initiate a new outbound call to the specified phone number.
    
    This endpoint:
    - Validates the phone number format
    - Generates a unique call ID
    - Emits a call initiation event through the V1 event system
    - Returns immediately with call status
    
    The actual call establishment is handled asynchronously through Azure Communication Services.

## Request body

- CallInitiateRequest: Request model for initiating a call.
  - `target_number` string, required: Phone number to call in E.164 format (e.g., +1234567890)
  - `caller_id` string, nullable: Caller ID to display (optional, uses system default if not provided)
  - `context` object, nullable: Additional call context metadata

## Response `200`

Call initiation successful

- CallInitiateResponse: Response model for call initiation.
  - `call_id` string, required: Unique call identifier
  - `status` string, required: Current call status
  - `target_number` string, required: Target phone number
  - `message` string, required: Human-readable status message

## Other responses

- `400`: Invalid request (e.g., malformed phone number)
- `422`: Validation Error
- `500`: Internal server error during call initiation

---

[API](https://skmtc.dev/azure/apis/real-time-voice-agent-api.md) - [All operations](https://skmtc.dev/azure/apis/real-time-voice-agent-api/llms.txt) - [OpenAPI document](https://skmtc.dev/azure/apis/real-time-voice-agent-api/revisions/3e24c76dccd5?raw)