A telephone entry system is an electronic device used for granting access to a secured area. It is a common feature in gated communities, apartment buildings, and office complexes. It allows visitors to communicate with residents or authorized personnel and gain entry to the premises. In this article, we will discuss how a telephone entry system works.Overview of a Telephone Entry SystemA telephone entry system consists of two main components: the entry panel and the interior telephone, or intercom. The entry panel is usually mounted near the gate or entrance, and it contains a keypad for visitors to