{
  "type": "start",
  "language": "en-US",
  "format": "raw",
  "encoding": "LINEAR16",
  "sampleRateHz": 8000,
  "interimResults": true
}

{
  "type": "stop"
}

{
  "type": "transcription",
  "is_final": false,
  "alternatives": [
    {
      "confidence": 0.85,
      "transcript": "Hello"
    }
  ],
  "channel": 0
}

{
  "type": "error",
  "error": "Upstream transcription service unavailable"
}