# Upload an audio part

`POST /api/v1/calls/{token}/chunk`

The body is raw audio bytes (`application/octet-stream`, max 8 MB per part). Parts must arrive in `i` order: a repeated part is ignored (`dup`), a skipped one returns `409`.

## Path parameters

| Field | Type | Description |
|---|---|---|
| `token` (required) | string | Token from `/calls/record`. |

## Query parameters

| Field | Type | Description |
|---|---|---|
| `i` (required) | integer | Part index (from 0). |