Check the following if you face issues with call quality:
- Refresh your browser.
- Check your device and internet connection.
- Run a network speed test at http://speedtest.net or https://fast.com . Recommended speed is 1Mbps for both upload/download, for the best experience
- If you are on WiFi make sure you have good WiFi signal. If not move closer to the WiFi access point or use a shared connection
- Close other applications that may be consuming bandwidth.