---
title: Audio Route Change Reasons
framework: audiotoolbox
role: collectionGroup
role_heading: API Collection
path: audiotoolbox/1618380-audio-route-change-reasons
---

# Audio Route Change Reasons

Identifiers for the various reasons that an audio route can change while your app is running.

## Overview

Overview You encounter these identifiers as values in the CFDictionary object passed to your property listener callback function when it is listening for audio route changes. See the description for kAudioSessionProperty_AudioRouteChange.

## Topics

### Constants

- [kAudioSessionRouteChangeReason_Unknown](audiotoolbox/kaudiosessionroutechangereason_unknown.md)
- [kAudioSessionRouteChangeReason_NewDeviceAvailable](audiotoolbox/kaudiosessionroutechangereason_newdeviceavailable.md)
- [kAudioSessionRouteChangeReason_OldDeviceUnavailable](audiotoolbox/kaudiosessionroutechangereason_olddeviceunavailable.md)
- [kAudioSessionRouteChangeReason_CategoryChange](audiotoolbox/kaudiosessionroutechangereason_categorychange.md)
- [kAudioSessionRouteChangeReason_Override](audiotoolbox/kaudiosessionroutechangereason_override.md)
- [kAudioSessionRouteChangeReason_WakeFromSleep](audiotoolbox/kaudiosessionroutechangereason_wakefromsleep.md)
- [kAudioSessionRouteChangeReason_NoSuitableRouteForCategory](audiotoolbox/kaudiosessionroutechangereason_nosuitablerouteforcategory.md)
- [kAudioSessionRouteChangeReason_RouteConfigurationChange](audiotoolbox/kaudiosessionroutechangereason_routeconfigurationchange.md)

## See Also

### Audio Routes

- [Audio Route Description Dictionary Keys](audiotoolbox/audio-route-description-dictionary-keys.md)
- [Audio Route Type Key](audiotoolbox/audio-route-type-key.md)
- [Audio Input Routes](audiotoolbox/audio-input-routes.md)
- [Audio Output Routes](audiotoolbox/audio-output-routes.md)
- [Audio Route Change Dictionary Keys](audiotoolbox/audio-route-change-dictionary-keys.md)
- [Alternative Audio Route Change Reason Dictionary Key](audiotoolbox/alternative-audio-route-change-reason-dictionary-key.md)