Creatio out-of-the-box Webitel functionality not working

Hi

I am trying to use Creatio out-of-the-box Webitel functionality to make internal calls. I have checked the Call center parameters setup in the Profile. But in the Call tab of the CTI panel, I see the following message:

"Phone server connection is unavailable. Please ensure that connection parameters are set up and that the server is online."

Can you tell me how to fix this?

thanks