If your wi-fi signal is too weak, voice traffic will be impacted and quality will not be optimal (voice may become distorted, delayed, or choppy).
Voice traffic over wifi requires the signal (RSSI) to have a minimum value of -65 dBm/-67 dBm (the closer to zero the better as this scale is negative) and that the signal is high enough with regards to the noise background (SNR); at least 25 dBm or higher.
How can I check if I meet the minimum requires for wifi signal strength if I am using Mac?
Checking whether the wifi signal your Mac computer is receiving is good enough for voice traffic is easy. Simply press the Option key and click on the wifi icon on your desktop bar.
Here you will see an RSSI line and a Noise line. Ensure the RSSI line is -65dBm/-67 dBm or higher (closer to zero) and that subtracting the Noise from the RSSI value gives a value of 25 or higher (in the example from the screenshot, that would be (-29)-(-88) = 59).
If both conditions are met, the signal is strong enough for voice traffic.
⚠️ Please note: Having a strong-enough wifi signal is necessary to ensure good call quality over wifi, but it is not enough. The signal may be strong but not stable, or the antenna or router may have trouble handling the amount of traffic it receives. Always make sure to check other factors as well to ensure call quality.