I'm currently unable to make or recieve any Skyp to Skype calls. I have the latest version of Skype, running on Windows 7 Professional. I have changed the Firewall settings to allow Skype. Tried the different wifi and LAN connections at work, but it is still saying call failed everytime I call somebody and when I ask people to call me to test, they are unable to call me. How can I fix this issue?