I installed latest skype to my centos 7.1 box however there is only virtual devices. The problem is described here http://community.skype.com/t5/Linux/After-4-3-0-37-the-divices-only-show-up-as-quot-virtual-device/td-p/3228886 People say they can use 220.127.116.11 however I can't find where to download it from. At official site - only latest version.
What happens to you is most likely because you don't have Pulseaudio running. Skype versions prior to 4.3 allowed to use ALSA directly but this is not the case any more. Microsoft have dropped the support for ALSA since version 4.3. You skype client only shows virtual devices, because it does not detect an instance of Pulseaudio running and cannot gain access to your audio devices.
The forum you have pointed to has outdated information. Downgrading to a version lower than 4.3 will not solve the problem.
After dropping ALSA support, including a number of vulnaribilities and introducing a backdoor into the Skype protocol Microsoft realized that significant number of users are downgrading their clients. Having realized that Microsoft started blocking the login attempts for clients with version lower than 4.3
If you want to continue to use skype you will have to upgrade to the newest version and either use Pulseaudio or try one of the known workarounds like apulse.
Download this and then
cd into your downloads directory, then type
sudo yum install skype-18.104.22.168-1.fc20.i686.rpm and it should be OK.