The Tesira HD-1 is a dialer for Tesira audio DSPs, providing access to all of the dialing functions within Tesira. With the look and feel of a traditional telephone dial pad, the HD-1 makes installations less expensive, easier to commission, and less complicated to operate. The four context (soft) buttons can be assigned to control functions in Tesira software. The HD-1 is compatible with Tesira SERVER and SERVER-IO with STC-2 or SVC- 2 cards installed, as well as all models of TesiraFORTÉ VT and TesiraFORTÉ VT4 devices.