curl --request POST \
  --url https://api.oneinbox.ai/v1/calls \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "agent_id": "<string>",
  "to_number": "+14155559876",
  "from_number": "<string>",
  "variables": {},
  "webhook_url": "<string>"
}
'

{
  "id": "<string>",
  "status": "<string>",
  "to_number": "<string>",
  "from_number": "<string>",
  "duration_seconds": 123,
  "transcript": [
    {
      "role": "<string>",
      "content": "<string>"
    }
  ],
  "created_at": "2023-11-07T05:31:56Z"
}