Video and Audio calls are not working in skype

I am using ubuntu 16.04. I installed the latest version of skype (V. 8.14.0.10). It's working fine in text message, but when i make a video or audio call it showing me error "Your connection is too weak. Please try again later.". I am using high speed Ethernet connection. I tried in windows using same network connection, it's working fine.

I disabled the firewall, but nothing worked.

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