A series of switching and speech processing manufacturers have announced support for Microsoft Corp’s Telephony Application Programming Interface on Windows NT. The implementation of the interface enables the Windows NT environment to function as a telephony client or a telephony server. The aim is to enable companies to move their telecommunications applications off single-function servers and integrate them with both client-based and server-based computer applications. The companies supporting Telephony Application Programming Interface will produce drivers that enable applications to integrate with their telephone switching or speech processing applications. These will include client-server telephony, applications servers for PABX telephone systems, call centre and automatic call distribution systems, interactive voice response servers, speech messaging and other communications applications. The companies promising support include Dialogic Corp, Digital Systems International Inc, Ericsson Business Networks AB, Fujitsu Business Communication Systems Ltd, GEC Plessey Telecommunications Ltd, NEC America Corporate Network Group, Northern Telecom Ltd and Toshiba Corp. Most already provide Telephony Application Programming Interface drivers that work with Windows 3.1 or Windows95, and all the companies are participants in the early beta programme for Telephony Application Programming Interface on Windows NT.