Third-Party CTI

Third-Party CTI

Third-party CTI is a particular kind of system architecture for computer-controlled telephony (Computer Telephony Integration - CTI). Third-party CTI differs from first-party CTI in terms of the underlying system architecture. With the help of third-party CTI or first-party CTI, it is possible to merge classic telephony with modern information technology. This results in a wide range of new functions and significant improvements in communication efficiency. By way of example, phone calls can be started directly by clicking on an address in a mail application, and additional information about a caller can be faded in on the screen.

Third-party CTI architecture and how it differs from first-party CTI

Unlike first-party CTI, where the phone is directly linked to the computer, third-party CTI does not require any connection of this kind. In the case of first-party CTI, there is a direct physical connection between the phone and the computer. With this type of link, a basic distinction is made between the computer-centric and the phone-centric connection model.
In the case of third-party CTI, the computer and phones communicate via a third component, the so-called CTI server. The latter is installed at a central point in the network and linked to the telephone system via a compatible interface. Incoming and outgoing calls are signalled via this interface. In addition, a so-called TC server rather than a telephone system is often used in modern architectures. Although using a CTI server is more complex than establishing a physical link between the phone and the computer in the case of first-party CTI, it results in far more flexible and efficient computer telephony integration. As a prerequisite for the proper functioning of the system and convenient use of the functions available, the network must operate efficiently without errors or delays. Bandwidth bottlenecks or data losses and data congestion can influence and disrupt the use of all company telephone functions. The advantage of a first-party CTI solution, namely faster workstation installation and configuration, is soon lost in the case of large-scale systems with a high number of telephone workstations. Therefore, third-party CTI is particularly suitable for large, high-performance systems.

Further information


CTI is the abbreviation for the technical term Computer Telephony Integration. It refers to a communications solution that, with the assistance of computer software, allows functions of the phone...

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