Normally when CallBurner runs for the first time, a Skype Permissions window appears to allow you to grant CallBurner permission to connect to the Skype application.
Under some circumstances, however, the Skype Permissions window may not appear. The steps below show you what to do if this occurs.
1. Reboot your PC and start Skype then CallBurner. [...]

If CallBurner’s Skype Access Permissions are not set correctly, CallBurner will not operate correctly.
You can configure the Skype Access Permissions as follows:
1. In Skype, go to “Tools > Options > Advanced > Updates”. (NOTE: In Skype 3.1 and earlier, go to “Tools > Options > Privacy” instead).
2. Click “Manage other programs’ access to Skype” (near [...]

If you have been sent to this page by CallBurner, there has been a problem giving CallBurner permission to connect to Skype. Skype usually asks you to allow access, but sometimes not in an obvious way, and sometimes not at all due to problems in Skype.
Skype 4.0 and later
Skype shows an “Allow access” button [...]