There are a lot of reasons why calls do not work.

 

Firstly, you need to launch C:\Users\%USERNAME%\AppData\Local\Client\webkit\nw.exe without parameters:

 

Информация о ресурсах для медиазвонков nw.exe

 

In this window, you see brief information about all your devices for connection (microphone, speakers, camera). If you have all of these, then move on.

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