If you want to integrate CTI Data Connector 4 directly in an application, there is a software development kit available, which supports multiple integration options (using a DLL, ActiveX, XML file for dialling).
The simplest way of an integration is to invoke the file dial.exe with the phone number as an parameter.
dial.exe phonenumber
Example
dial.exe +49700/54885342
The phone number is automatically formatted and special characters are removed