Setting up a reliable telephony system for a company can be a headache especially if the volume of staff is high and they are dispersed across the globe. Apart from traditional fixed lines, nowadays companies are also looking for alternatives. One of the trends is deployment of private virtual phone system accessible through various devices connected through internet. It's not only easily manageable but also saves good amount of money. 
OpenVBX is a powerful, open-source and web-based virtual telephony system made for businesses. It can be easily deployed on regular web servers as well as on a cloud system that supports LAMP stack. OpenVBX has a powerful configuration manager where you can design the hierarchy of your communication system and can segment it as per your needs.
The drag 'n drop call flow designer makes it very easy to design automated systems for various business processes. It has a rich set of APIs to integrate the telephony system with various web-based processes. Since you can easily access it's interface code (CSS), you can have completely customized theme that seamlessly integrate with your existing systems.
You can deploy text-to-speech, call recording, voicemail, call-conferencing, automated IVRs, SMS engine and many more features through OpenVBX. It also has a robust telephony client for iPhone users. There are dozens of plugins for OpenVBX to extend the functionality of this powerful software. These plugins are actively developed and supported by the community. A lively community forum ensures you get answers to your problem quickly.
If you're looking for a low-cost, robust and manageable web-based telephony system for your business, OpenVBX is one of the best solutions.
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