Hi @Nentwich Daniel, SF2-US-U-1 ,
Does this issue persist all the time?
Does anyone else have the same issue in your organization?
Please make sure your microphone or audio device is working correctly in another applications. If there is physical damage to the device or if the problem persists after restarting your computer, try using a different device.
Before making or receiving another call, check that the microphone is working, and check the audio quality by making a test call. For more details, you can refer to:
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