Report "handset switch (4302017) buzzes when used 1) headset adjust on setting 1 creates buzz heard on connected phone and on other party's line 2) headset adjust on 2 results in no sound or voice 3) Phone is nexxTech; Headset is nexxTech 4) Buzzing exists only when handset is picked up -- phone on Speaker setting results in no buzz. 5) The hum on the other party's line decreases when the connected phone volume is turned down Is this some sort of feedback problem that can be worked-around?"