INTERCOM SYSTEMS Whether you are looking for a simple residential, complex multi-family or commercial intercom system, each project has its own specific requirements and calls for exclusive solutions. There is no single optimum solution. Digital Security Concepts, INC. therefore offers variety of solutions for virtually any application. From simple handsets for door communication to deluxe handsets for internal communication with or without color or monochrome monitors, hands-free, and concierge stations are among the offered solutions.