"Asterisk," which is a popular open-source software platform for building communication applications. Asterisk is primarily used to create telephone systems, VoIP (Voice over Internet Protocol) gateways, conference servers, and other telecommunication applications. Key features and aspects of Asterisk include: VoIP Services: Asterisk is commonly used for setting up VoIP services, allowing voice communication over the internet. It supports various VoIP protocols such as SIP (Session Initiation Protocol) and IAX (Inter-Asterisk eXchange). Call Routing and PBX: Asterisk can function as a Private Branch Exchange (PBX), handling call routing within an organization. It allows for call management, call forwarding, voicemail, and more.