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# AudioSessionInterruptionListener

Invoked when an audio interruption in iOS begins or ends.

```
typealias AudioSessionInterruptionListener = (UnsafeMutableRawPointer?, UInt32) -> Void
```

## Parameters

`inClientData`

Data that you specified in the `inClientData` parameter of the [`AudioSessionInitialize(_:_:_:_:)`](/documentation/AudioToolbox/AudioSessionInitialize(_:_:_:_:)) function. Can be `NULL`.

`inInterruptionState`

A constant that indicates whether the interruption has just started or just ended. See [Audio Session Interruption States](/documentation/AudioToolbox/1618425-audio-session-interruption-state).

## Discussion

If you named your function `MyInterruptionListener`, you would declare it like this:

### Discussion

To register your interruption listener callback with your application’s audio session object, specify it in the [`AudioSessionInitialize(_:_:_:_:)`](/documentation/AudioToolbox/AudioSessionInitialize(_:_:_:_:)) function.

---

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