for videotelephony, high-speed fax, etc. Only the control system was standardized; getting data into and out of a computer remained an issue. There were a number of efforts by various vendors to support this functionality. Apple Computer was promoting GeoPort as the computer-end of such a system, and selected Telephony Server Application Programming Interface as the messaging protocol. The various vendors formed the Versit Consortium and published "The Versit CTI Encyclopedia." The Encyclopedia expanded the basic system to include a data-type identifier to allow it to switch any sort of "call". Additionally, Versit allowed that data to be switched to the computer using GeoPort or a number of other connection options. References Paul Cronin, "An Introduction to TSAPI and Network Telephony", IEEE Communications, April 1996 "Telephony Services Application Programming Interface (TSAPI)", NetWare Software Developer Kit, Release 5 (or later) xx Link is dead xx Application programming interfaces Telephone service enhanced features