CTI is the abbreviation for Computer Telephony Integration and implies the combination of telecommunication with electronic data processing. Using SwyxIt! Classic in a terminal server environment is only useful, if SwyxIt! Classic is operated in CTI mode. CTI SwyxIt! on a terminal server can e.g. control a local SwyxIt! Classic on another PC.
The CTI mode can be preset by the administrator. See also help.enreach.com/cpe/14.00/Administration/Swyx/en-US/index.html#context/help/Swyx_CTI_$.