Yeastar is described as 'Linkus is a VoIP Mobile Client coordinated with Yeastar PBXs that makes your iOS mobile phone an office extension and links you and your colleagues and customers anywhere anytime. Make and receive calls through corporate phone network to slash call costs and enhance efficiency' and is a IP PBX system in the social & communications category. There are three alternatives to Yeastar for a variety of platforms, including Linux, Mac, Windows, Web-based and Android apps. The best Yeastar alternative is Asterisk, which is both free and Open Source. Other great apps like Yeastar are 3CX and FreePBX.
Asterisk is an open source framework for building communications applications. Asterisk turns an ordinary computer into a communications server. Asterisk powers IP PBX systems, VoIP gateways, conference servers and other custom solutions.
3CX is a software-based, open standards IP PBX that offers complete Unified Communications, out of the box.
Offers a free trial period, after with you need to upgrade to paid subscription.
FreePBX is a web-based open source GUI (graphical user interface) that controls and manages Asterisk (PBX), an open source communication server.
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