During KazooCon, Yealink and Polycom both promoted their sound cancellation features. I decided to do some testing on these features to see just how effective they are. I thought I'd share my results and testing methodologies with you all. Testing Methodology I created an audio file that included music, conversations, kids playing and dogs barking. I've included it here for you as TestBackground.wav. Then, I made custom configuration profiles for each setting I wanted to test. Yea