If you have integrated the Liveness SDK (IOS), but there is no sound after integration, then this is the part of the code that you need to check
On the AAILivenessViewController check for willPlayAudio
Try add a breakpoint to check, if method "willPlayAudio:" is called during liveness detection, it should be called when detection type changes.

If method "willPlayAudio:" is called, then check method "playAudio:" in AAILivenessUtil.m

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