disableClickToDial() for Salesforce Classic

Disables click-to-dial.

Name	Type	Description
`callback`	function	JavaScript method executed when the API method call is completed.

This method is asynchronous. The response is returned in an object passed to a callback method. The response object contains the following fields.

Name	Type	Description
`result`	boolean	`true` if click-to-dial was disabled, `false` if click-to-dial wasn’t disabled.
`error`	string	If the API call was successful, this variable is undefined. If the API call failed, this variable returns an error message.