private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.speech.v2.StreamingRecognitionFeatures.VoiceActivityTimeout,
            com.google.cloud.speech.v2.StreamingRecognitionFeatures.VoiceActivityTimeout.Builder,
            com.google.cloud.speech.v2.StreamingRecognitionFeatures.VoiceActivityTimeoutOrBuilder>
        getVoiceActivityTimeoutFieldBuilder() {
      if (voiceActivityTimeoutBuilder_ == null) {
        voiceActivityTimeoutBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.speech.v2.StreamingRecognitionFeatures.VoiceActivityTimeout,
                com.google.cloud.speech.v2.StreamingRecognitionFeatures.VoiceActivityTimeout
                    .Builder,
                com.google.cloud.speech.v2.StreamingRecognitionFeatures
                    .VoiceActivityTimeoutOrBuilder>(
                getVoiceActivityTimeout(), getParentForChildren(), isClean());
        voiceActivityTimeout_ = null;
      }
      return voiceActivityTimeoutBuilder_;
    }
<pre>
If set, the server will automatically close the stream after the specified
duration has elapsed after the last VOICE_ACTIVITY speech event has been
sent. The field `voice_activity_events` must also be set to true.
</pre>

<code>
.google.cloud.speech.v2.StreamingRecognitionFeatures.VoiceActivityTimeout voice_activity_timeout = 3;
</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/StreamingRecognitionFeatures.java