T58 Audio Issues Via WiFi

[stratos]

Here in my home office I have a Yealink T58A & a T48S connected via WiFi. The audio quality on T58A calls is poor. But calls on the T48S are great. Both phones are in the same room and equal distance from the WiFi router.

I have reset the T58A and the WiFi router but still no improvement on calls. Any insight would be much appreciated.