Audio quality issues might be caused by the audio device that another caller is using. Ask others on the call to help check the following:
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If they are using their webcam’s microphone or computer speakers, ask them to try using a different audio device.
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Make sure the device they are using is optimized for Skype for Business communications software. For a list of optimized devices, see Phones and Devices for Skype for Business.
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Have the presenter mute the participant who has the malfunctioning device.
