Telephone: a device used to send and receive voice communications simultaneously. There are billions of telephones in use, making it the most used telecommunications tool in the world. This article outlines the components of the contemporary telephone and follows its evolutionary history.

Telephone, an instrument designed for the simultaneous transmission and reception of the human voice. The telephone is inexpensive, is simple to operate, and offers its users an immediate, personal type of communication that cannot be obtained through any other medium.

EPABX stands for Electronic Private Automatic Branch Exchange which is a private telephone network used by the organizations and the companies for various types of communication, either between the employees or outside the clients.

The Telephone module allows you to create fields that contain telephone numbers. It depends on the Field and the Field UI modules. As with other fields a telephone field can be added to any bundle. This means you can add a telephone field to a user, a content type (news, event) or custom block.

IPM (Intelligent Power Module) is a high-performance module that mounts a dedicated drive circuit for drawing greater performance from an IGBT chip, and it provides a custom IC for executing self-protection functions (short circuit, supply under voltage, and over temperature).