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# kAudioSessionProperty_AudioRouteChange

The reason the audio route changed.

```
var kAudioSessionProperty_AudioRouteChange: Int { get }
```

## Discussion

A <doc://com.apple.documentation/documentation/CoreFoundation/CFDictionary> object containing the reason the audio route changed along with details on the previous and current audio route.

## Discussion

The dictionary contains the keys and corresponding values described in [Audio Route Change Dictionary Keys](/documentation/AudioToolbox/audio-route-change-dictionary-keys).

The [`kAudioSessionProperty_AudioRouteChange`](/documentation/AudioToolbox/kAudioSessionProperty_AudioRouteChange) dictionary is available to your app only by way of the [`AudioSessionPropertyListener`](/documentation/AudioToolbox/AudioSessionPropertyListener) callback function.

---

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