Spec Sheet Preview: Alpha Communications® Stainless Steel Faceplate Telephone Entry Systems are designed for easy operation and are available in models with a number capacity of 1 - 750 units (7 digits/10 digits/11 digits). Units can be used as standard 'dialer' type or 'no-phone-bill' type (with additional equipment). Both models are standard in an open voice (loudspeaking) configuration.