GTI, a graphical telephone interface

Graphical Telephone Interface (GTI) is a screen-based telephony application for telecommunication services. It provides an intuitive user interface to the myriad of services and features in state-of-the-art communication systems, such as ISDN or a digital (ISDN) PBX. As a high-end telephony user interface, GTI controls voice and data connections with the comfort and ease of use to today's graphical user interfaces.