Audio routing issue

[hehooleehoo]

On iOS, when joining a LiveKit room without the local microphone enabled, remote audio plays through the physical earpiece (receiver) instead of the bottom loudspeaker, despite using configureAudio({ ios: { defaultOutput: "speaker" } }), selectAudioOutput("force_speaker"), and setAppleAudioConfiguration. The only reliable workaround is briefly enabling the microphone, which causes an audible bleep and risks transmitting audio when users should not speak (listen-only sessions).

To Reproduce

Steps to reproduce the behavior:

1. Create an Expo app with @livekit/react-native, @livekit/react-native-webrtc, call registerGlobals() at startup
2. Connect to a LiveKit room with remote audio (e.g. host speaking) using the connect flow below
3. Join without enabling the microphone
4. Hold phone at arm's length — audio is inaudible (routed to earpiece)
5. Enable microphone — audio immediately switches to loudspeaker ✅

Minimal connect flow:

await AudioSession.configureAudio({ ios: { defaultOutput: 'speaker' } });
await AudioSession.startAudioSession();
// selectAudioOutput before connect throws OSStatus -50
await room.connect(url, token);
// After connect: selectAudioOutput + setAppleAudioConfiguration have no effect
if (Platform.OS === 'ios') {
  await AudioSession.setAppleAudioConfiguration({
    audioCategory: 'playAndRecord',
    audioCategoryOptions: ['defaultToSpeaker', 'allowBluetooth', 'allowBluetoothA2DP', 'allowAirPlay'],
    audioMode: 'videoChat',
  });
  await AudioSession.selectAudioOutput('force_speaker');
}

Expected behavior

• Audio should route to loudspeaker when defaultOutput: "speaker" is set
• selectAudioOutput("force_speaker") should work after connect without errors
• selectAudioOutput before connect should not throw OSStatus -50

Screenshots

N/A — audio routing behavior.

Device Info:

• Device: testing on iPhone 13
• OS: iOS 26.2.1

Dependencies Info (please reference your package-lock.json or yarn.lock file, not just your package.json):

• @livekit/react-native: 2.9.6
• livekit-client: 2.16.1
• react-native-webrtc: @livekit/react-native-webrtc 137.0.2

Additional context

What we've tried (none work):

• selectAudioOutput("force_speaker") before connect → throws OSStatus -50 (paramErr)
• selectAudioOutput + setAppleAudioConfiguration at 100ms, 300ms, 800ms, 2s, 4s after connect → no error, no effect
• room.on("trackSubscribed", ...) → apply config when first remote audio subscribes → no effect
• Patched selectAudioOutput to use RTCAudioSession instead of AVAudioSession → OSStatus -50, connection fails
• showAudioRoutePicker() shows Speaker selected, but physical output is still earpiece → suggests session/config mismatch

Behavior summary:

Scenario	Result
Join (no mic)	❌ Earpiece
Join with Bluetooth	❌ Earpiece
Bluetooth disconnect mid-call	❌ Earpiece (expected: loudspeaker)
Enable mic	✅ Loudspeaker
If speaker already on → BT connect → BT disconnect	✅ Loudspeaker

[hehooleehoo]

So I managed to fix this by setting the audioCategory to playback instead of playAndRecord. This means that the request to default to speaker is respected without forcing it.

In my application participants can only speak when invited, so I then just change the audioCategory to playAndRecord when enabling the microphone.

I still think there is a bug here because playAndRecord still defaults to receiver instead of loudspeaker, despite our defaultToSpeaker preference. And then when in this mode, toggling microphone then seems to trigger the loudspeaker activation which is quite unpredictable behaviour

[davidliu]

Have you tried useIosAudioManagement? This was created to handle the automanagement of the audio session depending on whether there are local or remote tracks.

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The AudioSession.setAppleAudioConfiguration method is essentially just a passthrough helper method for configuring the underlying AVAudioSession, and we don't control the code there. If you use this method directly, you're taking responsibility for understanding how Apple has chosen things to work there (which is unfortunately fairly opaque).