Hello everybody,

here I want to leave a short notice on how to avoid hearing yourself if you are connected over TeamViewer to somebodies computer. By defualt TeamViewer duplicates sound that goes through sound system of computer to which you've connected.

Not many people know, that such functionality can be disabled. For this purpose you need to navigate to the following: 

1. Communicate
2. Computer Sound
3. Remove checkbox. 

After those steps you'll be able to avoid hearing sound of yourself via skype or other communication utility.

For convenience I have also screenshot: