The xtelsio TAPI Driver for Asteriskâ„¢ supports basic TAPI functions for your existing TAPI application and this for multiple lines of one or several Asterisk systems. The TAPI Driver supports dialling and hanging up as well as signalling telephone numbers of incoming and outgoing calls. The TAPI driver can be installed on a Windows Server (also on a Terminal Server) or on every client computer. Experimental: Consultation, Transfer and Conference