Security intercom systems are used to provide voice communications between two or more locations for security purposes.

Security intercom systems are frequently used between a locked building entrance door and a constantly attended location in the building, such as a manned security control room.

In this application, the security intercom system gives visitors a means to contact someone in the building when they arrive at the entrance door.

Other common locations where security intercom systems are used in commercial buildings includes loading dock doors and at vehicle gates that provide entrance to the property.

In residential applications, security intercom systems are commonly used between the main entrance door and a location within the interior of the home.