Since three different headsets and multiple USB ports show the same behavior, focus on Windows 11 microphone settings and the audio driver.
- Check the obvious hardware state
- Make sure the headset mute button is not enabled.
- Confirm the headset is connected correctly.
- Verify the correct input device is selected
- Go to Start > Settings > System > Sound.
- Under Input, select the headset microphone under Choose a device for speaking or recording.
- Select the > next to that device.
- Under Microphone test, select Start test, speak normally, then Stop test and Play the recorded sample.
- If the sample is clear there but calls still fade in and out, continue with the privacy and driver steps below.
- Make sure microphone access is enabled in Windows 11
- Go to Start > Settings > Privacy & security > Microphone.
- Turn on Microphone access.
- Turn on Let apps access your microphone.
- If the problem happens in a specific app, make sure that app is also enabled in the list.
- Turn on Let desktop apps access your microphone.
- Run the built-in audio troubleshooters
- Go to Start > Settings > System > Troubleshoot > Other troubleshooters.
- Run the Audio troubleshooter.
- Also go to Start > Settings > System > Sound.
- Scroll to Advanced and use the sound troubleshooting options there, including All sound devices if available.
- Turn off audio enhancements
- Go to Start > Settings > Sound.
- In Output, select the audio device being used.
- On that page, scroll to Advanced settings and set Audio enhancements to Off.
- This can help when audio processing causes distortion or unstable sound.
- Reinstall the audio driver
- Warning: this temporarily removes the audio device until Windows reinstalls it after restart.
- Right-click Start and select Device Manager.
- Expand Sound, video and game controllers.
- Right-click each audio device and select Uninstall device.
- If prompted, check Attempt to remove the driver for this device or Delete the driver software for this device, then select Uninstall.
- Restart the PC.
- After restart, open Device Manager again. If needed, right-click Sound, video and game controllers and select Scan for hardware changes.
- Then right-click the audio driver and select Update driver.
- If Windows is hearing the mic but callers still report static
- The accepted Microsoft Q&A guidance for similar symptoms points to microphone processing such as Noise Suppression, Echo Cancellation, or other Audio Enhancements filtering the signal.
- Check the microphone device properties and disable those enhancements if present.
- On some systems these controls may also appear in vendor audio software.
Because the issue happens across three headsets, the strongest next step is the driver reinstall plus disabling audio enhancements/noise suppression.