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  • Ensure that all users are in separated physical environments (no near-field tests).
  • Check if an external audio source is used and if the captured external audio source is normal.  The noise in In this case, noise cancellation is not supported and the noise may be caused by data loss during the audio transmission to the SDK. Noise cancellation is not supported here.
  • Check if any user is talking in a noisy environment. 
  • Check if the recording device is working properly. For example, check whether the headset is plugged in correctly, use another headset, or switch to another audio route.