I have Ubuntu 14.04.1 and Skype 4.03.0.37.
my audio devices are working fine but when I make Skype calls I can't hear the other person neither they can hear me.

when I checked Skype audio settings it showed virtual device as the only option for all devices.

I tried a lot of proposed solutions on the web and nothing helped.

what could be the problem and how can I fix it?

I know there is not a lot of details in the question to help, what extra details do I need to provide ?

Thank you so much.