If you suspect your internet connection is experiencing issues that are impacting the quality of your calls, one quick test you can make to try to confirm is changing the network to which your computer is connected.
One quick and easy way to do this is using your mobile phone “as a router” and sharing its cellular 4G/5G data, connecting your computer to it.
To do this, you just have to allow your mobile phone to share the cellular data and to be detected as an available WiFi connection. Once you've done that, you just have to search from your computer the WiFi networks around you and connect to the one of your mobile phone, which should be displaying in the list.
In these two articles from Apple and Android you can see how to share your cellular data and make your phone visible as a WiFi network:
Once your computer is connected to your tethered mobile data, use Aircall as you normally do, making and answering calls, and monitor if you notice a difference with your previous connection, which would help confirm any potential issues on your usual network.
Even if you are not experiencing any network issues, note that this connection method can be a great way to use Aircall if you have to work on the go!