If you are experiencing issues with call quality on your cordless phone, chances are it is due to your home Wi-Fi.
Do Cordless Phones Interfere with Wi-Fi Networks? | EMF Protection
Wireless home appliances such as microwave ovens, cordless phones, and baby monitors can interfere with Wi-Fi wireless network radio signals. However, Wi-Fi signals can generate interference in the other direction, toward certain types of cordless phones. Placing a Wi-Fi router too close to a cordless phone base station can result in degraded voice quality on the cordless phone.
This problem does not occur with all cordless phone base stations. It is most common when the cordless phone and the Wi-Fi router both operate on the same radio frequency. For example, a router and base station that both operate on the 2.4 GHz band are likely to interfere with each other.
If you are experiencing interference with your cordless phone, the solution is very simple: increase the distance between your home router and the phone's base station.
