Asterisk is a software implementation of a telephone private branch exchange (PBX).
This is a comparison of voice over IP (VoIP) software used to conduct telephone-like voice conversations across Internet Protocol (IP) based networks.
FreePBX is a web-based open source graphical user interface (GUI) that manages Asterisk, a voice over IP and telephony server.
The Hacienda Guachalá is known as the oldest hacienda in Ecuador, and the most important hacienda until the middle of the 20th century.
Issabel is open-source Unified Communications PBX software, providing user-friendly web-based configuration, management, and reporting for telephony.
This list of SIP software documents notable software applications which use Session Initiation Protocol (SIP) as a voice over IP (VoIP) protocol.
Skype for Business Server (formerly Microsoft Office Communications Server and Microsoft Lync Server) is real-time communications server software that provides the infrastructure for enterprise instant messaging, presence, VoIP, ad hoc and structured conferences (audio, video and web conferencing) and PSTN connectivity through a third-party gateway or SIP trunk.
SourceForge is a Web-based service that offers software developers a centralized online location to control and manage free and open-source software projects.
trixbox (formerly Asterisk@Home) was a software PBX based on Asterisk.
Unified communications (UC) is a business and marketing concept describing the integration of enterprise communication services such as instant messaging (chat), presence information, voice (including IP telephony), mobility features (including extension mobility and single number reach), audio, web & video conferencing, fixed-mobile convergence (FMC), desktop sharing, data sharing (including web connected electronic interactive whiteboards), call control and speech recognition with non-real-time communication services such as unified messaging (integrated voicemail, e-mail, SMS and fax).
3CX is an international VoIP IPBX software developer.