Intercom Systems - An intercom system provides not only the advantage of knowing who's there, but the peace of mind as well and it can be used in place of the standard doorbell. Now you can know who's at your door before you open it as well as hear who is there. Bass offers world class Doorbell intercom systems that add security to convenience, allowing you to answer the door and open it from any telephone in the house, even a cordless phone. This is called absolute convenience at your doorstep!