# 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 `isHost` before exposing host controls in your UI. For the basic controls available to every user, see [Core features](/docs/video-sdk/ios/audio/).

```swift
let isHost = ZoomVideoSDK.shareInstance()?.getSession()?.getMySelf()?.isHost()
```

```objectivec
BOOL isHost = [[[[ZoomVideoSDK shareInstance] 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.

```swift
// Host sends the request.
ZoomVideoSDK.shareInstance()?.getAudioHelper()?.unmuteAudio(remoteUser)
```

```objectivec
// Host sends the request.
[[[ZoomVideoSDK shareInstance] getAudioHelper] unmuteAudio:remoteUser];
```

On the target user's device, implement `onHostAskUnmute`.

```swift
func onHostAskUnmute() {
    // Show a dialog asking the user to unmute, then call:
    // if let mySelf = ZoomVideoSDK.shareInstance()?.getSession()?.getMySelf() {
    //     ZoomVideoSDK.shareInstance()?.getAudioHelper()?.unmuteAudio(mySelf)
    // }
}
```

```objectivec
- (void)onHostAskUnmute {
    // Show a dialog asking the user to unmute, then call:
    // ZoomVideoSDKUser *mySelf = [[[ZoomVideoSDK shareInstance] getSession] getMySelf];
    // [[[ZoomVideoSDK shareInstance] getAudioHelper] unmuteAudio:mySelf];
}
```

## 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`.

```swift
let audioHelper = ZoomVideoSDK.shareInstance()?.getAudioHelper()

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

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

```objectivec
ZoomVideoSDKAudioHelper *audioHelper = [[ZoomVideoSDK shareInstance] getAudioHelper];

// Mute everyone but let them unmute themselves later.
[audioHelper muteAllAudio:YES];

// Mute everyone and prevent self-unmute.
[audioHelper muteAllAudio:NO];
```

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

```swift
ZoomVideoSDK.shareInstance()?.getAudioHelper()?.unmuteAllAudio()
```

```objectivec
[[[ZoomVideoSDK shareInstance] getAudioHelper] unmuteAllAudio];
```

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

```swift
let audioHelper = ZoomVideoSDK.shareInstance()?.getAudioHelper()

// Allow self-unmute.
audioHelper?.allowAudioUnmutedBySelf(true)

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

```objectivec
ZoomVideoSDKAudioHelper *audioHelper = [[ZoomVideoSDK shareInstance] getAudioHelper];

// Allow self-unmute.
[audioHelper allowAudioUnmutedBySelf:YES];

// Block self-unmute.
[audioHelper allowAudioUnmutedBySelf:NO];
```