Tesira HD-1 Hardware Dialer for Tesira Audio DSPsThe 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