A public address system gives you an immediate way to address everyone at a given location. Even though it’s a more traditional form of communicating to large groups of people, it still offers advantages over modern formats. Security systems can also be enhanced through the use of PA systems. You can use automated PA systems to inform people if they need to evacuate or deliver other important information. Emergency PA systems paired with other safety and security systems provide you with the tools you need to inform customers, employees and students of potential dangers and direct them to safety. PA over IP paging and intercom systems that use an Internet Protocol (IP) network, instead of a central amplifier, to distribute the audio signal to paging locations across a building or campus, or anywhere else in the reach of the IP network, including the Internet. Network-attached amplifiers and intercom units are used to provide the communication function. At the transmission end, a computer application transmits a digital audio stream via the local area network, using audio from the computer's sound card inputs or from stored audio recordings.