The ctiSVR is a CTI server for IVR system and front-end applications. The tool uses TSAPI library to monitor IVR and agent extensions, it hides the technical details of TSAPI and provide a simple REST, WebSocket and OCX interface for IVR system and front-end applications to perform CTI call control functions. The ctiSVR program supports passing of customized user data between different kind of CTI software when a customized DLL is developed.