Calisto 800 Speakerphone Calisto 800 Speakerphone from Terry McCallum Calisto 800 Speakerphone Managed the design and engineering of top half of the product including user interface, touch screen, back lighting and LCD mounting. gLike Calisto 800 Speakerphone Managed the design and engineering of top half of the product including user interface, touch screen, back lighting and LCD mounting. Engineering Share R 7 n Terry McCallum Senior Product Development Engineer Milwaukee, WI Follow Contact