1. Try using ear tips that fit more snugly and ensure the earbuds are positioned correctly to create a proper seal. An improper fit can affect call quality.

2. Fully charge your earbuds and reset them as follows:

- Place the earbuds in the charging case and leave the case open.

- After putting on the earbuds, simultaneously press and hold the touch area on both earbuds for 10 seconds. Hearing a prompt tone confirms a successful reset.

3. Ensure "soundcore  P31i/R60i NC" is selected as the audio output on your connected device and increase the volume on your device.

4. If the call was made through an app, try using your phone's native calling feature instead to see if the issue persists.

5. Test the earbuds with a different Bluetooth device and in a different environment to see if there is any difference.

6. Try calling other contacts to see if you experience similar issues, ensuring it's not due to poor network reception on their end.

If you encounter any other issues or your issue has not been resolved, please contact us for further assistance.