---
title: Audio Route Change Dictionary Keys
framework: audiotoolbox
role: collectionGroup
role_heading: API Collection
path: audiotoolbox/audio-route-change-dictionary-keys
---

# Audio Route Change Dictionary Keys

Keys for obtaining information about an audio hardware route change.

## Topics

### Constants

- [kAudioSession_RouteChangeKey_Reason](audiotoolbox/kaudiosession_routechangekey_reason.md)
- [kAudioSession_AudioRouteChangeKey_PreviousRouteDescription](audiotoolbox/kaudiosession_audioroutechangekey_previousroutedescription.md)
- [kAudioSession_AudioRouteChangeKey_CurrentRouteDescription](audiotoolbox/kaudiosession_audioroutechangekey_currentroutedescription.md)

## See Also

### Audio Routes

- [Audio Route Change Reasons](audiotoolbox/1618380-audio-route-change-reasons.md)
- [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)
- [Alternative Audio Route Change Reason Dictionary Key](audiotoolbox/alternative-audio-route-change-reason-dictionary-key.md)