{
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  "event": "live.speech_start",
  "payload": {
    "session_id": "4a39145c-2844-4557-8f34-34883f7be7d9",
    "created_at": "2021-09-01T12:00:00.123Z",
    "type": "speech_start",
    "data": {
      "time": 12.56,
      "channel": 1
    }
  }
}