---
title: "Start Call"
method: POST
path: "/sessions/{session_id}/start-call"
tags: ["sessions"]
---

# Start Call

`POST /sessions/{session_id}/start-call`

## Request

- Base URL: `https://dev.whispa.net` (the document declares no server; this is the origin it was published from)
- URL: `https://dev.whispa.net/sessions/{session_id}/start-call`
- Auth: one of:
  - OAuth 2
    - Password
    - Token URL: `auth/bearer/login`
  - API key in cookie `access_token`

Start a call for this session.

Creates a CallSession record so the call appears in call history immediately.
Used by frontend for training calls where ElevenLabs handles audio directly.

Args:
    session_id: Session ID (must be created first via POST /sessions)
    scenario: Optional scenario identifier (e.g., "debt_collection")
    persona_id: Optional training persona practised against (training calls)

## Path parameters

- `session_id` string, uuid, required

## Query parameters

- `scenario` string, nullable
- `customer_number` string, nullable
- `persona_id` string, uuid, nullable

## Response `200`

Successful Response

- object

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/whispa/apis/whispa-api.md) - [All operations](https://skmtc.dev/whispa/apis/whispa-api/llms.txt) - [OpenAPI document](https://skmtc.dev/whispa/apis/whispa-api/revisions/12c2e4aca43c?raw)