AVAudioSessionModeVoiceChat

To enable platform acoustic echo cancellation (AEC), the iOS device must be in AVAudioSessionModeVoiceChat. For more information, see the Apple developer documentation.

AVAudioSessionModeVoiceChat changes EQ to optimize for voice. Because of this change, any non-voice audio that the iOS app plays might seem quieter. The Voice-Processing I/O unit also mixes the audio to ensure that the voice is the loudest part of the overall audio mix.

Note: Although it is possible to change the AVAudioSession mode to default after activating the Voice-Processing I/O unit, Apple recommends using AVAudioSessionModeVoiceChat. Using the default mode when the Voice-Processing I/O unit is active might cause unpredictable behavior, and various device types (for example, iPad and iPhone) might behave in different ways.

Unity logo Documentation
Copyright © 2025 Unity Technologies
"Unity", Unity logos, and other Unity trademarks are trademarks or registered trademarks of Unity Technologies or its affiliates in the U.S. and elsewhere (more info here). Other names or brands are trademarks of their respective owners.