The Asterisk GUI (Graphical User Interface) is a web-based interface that provides an easy way to configure, manage, and monitor the Asterisk open-source telephony software. It allows users to interact with Asterisk without needing to use complex command-line commands or editing configuration files manually. The GUI simplifies tasks such as setting up extensions, creating dial plans, managing voicemail, and monitoring system activity. Key features of the Asterisk GUI include: User-Friendly Interface: The GUI presents a user-friendly web interface that makes it accessible for administrators and users with varying levels of technical expertise. Configuration Management: Users can configure various aspects of Asterisk, such as extensions, dial plans, trunks, voicemail, conference rooms, and more, using intuitive forms and settings. Visual Dial Plan Editor: The GUI often includes a visual dial plan editor that allows users to create and modify call routing logic graphically, reducing the need for manual configuration file editing. Voicemail Management: Administrators and users can set up and manage voicemail boxes, customize greetings, and retrieve voicemail messages through the GUI. Real-Time Monitoring: The GUI provides real-time monitoring of system activity, showing active calls, extensions, trunks, and other important statistics. Security Settings: Users can configure security settings, access controls, and authentication mechanisms to protect the Asterisk system and sensitive data. Remote Management: The GUI is accessible remotely, allowing administrators to manage Asterisk deployments from anywhere with an internet connection. Module Support: Some Asterisk GUIs support modular functionality, enabling users to extend the capabilities of their Asterisk system by adding or customizing modules. It's important to note that there are several different Asterisk GUIs available, developed by different organizations or individuals. Some popular Asterisk GUIs as of my last knowledge update in September 2021 include FreePBX, Elastix, and Issabel. However, the specific features and functionalities of each GUI may vary. Since software development and projects can evolve, I recommend checking the latest sources or documentation for the specific Asterisk GUI you're interested in to get the most up-to-date information and features.