There are many VoIP based PBX software available in the market. Some of them are open source and free whereas some are chargeable. Some VoIP software need to install alongside your running operating system like Windows or Linux, and some are ready to install as a server.
There are open source PBX software solutions available which we are trying to list here. With the right team of developers and IT engineers any business can develop their own in house PBX software/server. From small to enterprise level, the shoe is not necessarily one size fits all. The choice is absolutely yours. Here we are listing some VoIP software and servers which you can look through…
Asterisk is essentially father of all open-source PBX and VoIP solutions. The Asterisk team also developed their own alternate protocol to SIP named IAX and upgraded to later on as IAX2. The software comes with the standard PBX features including an interactive voice response, automatic call distribution, conference calling, call recording, and the usual voicemail. Asterisk makes it possible to turn any computer into a communications server. You can also install it on your running operating system (we recommend Linux).
You can download Asterisk for free from their official website here.
Elastix is a high performance easy to upgrade PBX. Powered by 3CX you get a full-featured unified communications platform with softphones included for Android, iOS, Windows and Mac. It is easy to configure PBX comes with GUI based management system. You also get inbuilt video conferencing based on WebRTC.
You can download and explore Elastix for free from here.
FreePBX is an Asterisk based open source communication server. It is a web-based GUI platform. FreePBX is licensed under the GNU General Public License (GPL). It can be installed manually or you can install a whole pre-configured FreePBX Distro that comes with the system OS, Asterisk, FreePBX GUI and assorted dependencies. FreePBX also includes a long list of commercial modules and add-ons to enhance your system with even more features.
Download and explore FreePBX from here.
3CX is a software-based, open standards IP PBX , free for use upto four simultaneous number of calls. The developers made 3CX very easy to install and manage, so that you can effortlessly manage it by yourself. With adoption of WebRTC Web conferencing is also possible.
3CX also offers Click2Call service for your website or CRM, which leads to improve your customer experience.
You can explore more features and pricing at their official website.