background noise/static

Anyone recommend a good phone to gut down on white noise/static.

Device Yeastar S50 

current phones Yealinks t42's and t23's

have one user constantly complains about static(white noise)

current incoming  phones (pots) AT&T

I have  change RX volume to 60% and TX to 80%(under trunks)

Any other settings or change i can make to cut down on background noise or increase signal to noise ratio


Thank you


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