This blog article explains what to do if your desktop TelephoneIntegration (TI) Client is not working.
Please check your current Skype desktop Client version and make sure that is not higher than version 6.21.
The Skype desktop API commands for calls are broken in both 6.22 and 7.0. Skype developers are working to fix the problem. In the meantime, please use Skype version 6.21.
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