12-07-2011 00:51 - edited 12-07-2011 00:53
Please do the following using the Skype Main window:
Tools -> Options -> Privacy Settings
If you see a button that says "Show Advance Options" please click it.
First check your privacy settings are set to ''Allow calls from anyone''.Then change them to "Allow SkypeIn calls from Only people from my Contacts List".Save and wait for 5 minutes.Log out from your Skype account and log back in. Change settings back to "Allow calls from Anyone". Save and wait for 5 minutes.Log out from your Skype account and log back in.