The Cornell 4200 series annunciator panel works with Cornell’s 4200 call stations opening up a voice communication from master panel to station when call is initiated at call station. The master control panel has a red, green and yellow LED per zone to indicate call placed, call answered and fault respectively. When call is initiated, button must be depressed and then push to talk must be pressed in order to open voice communication. The anodized aluminum faceplate with silk-screened designations is to be flush mounted on a Cornell provided back box or surface mounted on Cornell provided wood enclosure.