# Host audio controls

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The controls in this topic have an effect only when the local user is the session host. Check `mySelf().isHost()` before exposing host controls in your UI. For the basic controls available to every user, see [Core features](/docs/video-sdk/android/audio/).

```kotlin
val isHost = ZoomVideoSDK.getInstance().session.mySelf.isHost
```

```java
boolean isHost = ZoomVideoSDK.getInstance().getSession().getMySelf().isHost();
```

## Ask a single user to unmute

When the local user is the host, calling `unMuteAudio` on a remote user does not unmute them directly. It sends an unmute request. The target user's app receives the `onHostAskUnmute` callback and is responsible for prompting the user before calling `unMuteAudio` on themselves.

```kotlin
// Host sends the request.
audioHelper.unMuteAudio(remoteUser)
```

```java
// Host sends the request.
audioHelper.unMuteAudio(remoteUser);
```

On the target user's device.

```kotlin
override fun onHostAskUnmute() {
    // Show a dialog asking the user to unmute, then call:
    // ZoomVideoSDK.getInstance().audioHelper.unMuteAudio(
    //     ZoomVideoSDK.getInstance().session.mySelf
    // )
}
```

```java
@Override
public void onHostAskUnmute() {
    // Show a dialog asking the user to unmute, then call:
    // ZoomVideoSDK.getInstance().getAudioHelper().unMuteAudio(
    //     ZoomVideoSDK.getInstance().getSession().getMySelf()
    // );
}
```

## Mute or unmute everyone

The host can mute every participant at once with `muteAllAudio`. Passing `true` lets participants unmute themselves afterward; passing `false` keeps them muted until the host unmutes them or grants self-unmute with `allowAudioUnmutedBySelf`.

```kotlin
// Mute everyone but let them unmute themselves later.
audioHelper.muteAllAudio(true)

// Mute everyone and prevent self-unmute.
audioHelper.muteAllAudio(false)
```

```java
// Mute everyone but let them unmute themselves later.
audioHelper.muteAllAudio(true);

// Mute everyone and prevent self-unmute.
audioHelper.muteAllAudio(false);
```

To request unmute from every participant (each user still has to accept on their device via `onHostAskUnmute`), call `unmuteAllAudio`.

```kotlin
audioHelper.unmuteAllAudio()
```

```java
audioHelper.unmuteAllAudio();
```

Toggle whether participants can unmute themselves at any time with `allowAudioUnmutedBySelf`.

```kotlin
// Allow self-unmute.
audioHelper.allowAudioUnmutedBySelf(true)

// Block self-unmute.
audioHelper.allowAudioUnmutedBySelf(false)
```

```java
audioHelper.allowAudioUnmutedBySelf(true);
audioHelper.allowAudioUnmutedBySelf(false);
```