Add FusionPBX to IPBX telephony software section

README.md

@@ -347,6 +347,7 @@ _[SIP](https://en.wikipedia.org/wiki/Session_Initiation_Protocol) telephony soft
 _[IPBX](https://en.wikipedia.org/wiki/IP_PBX) telephony software_
 
   * [Freepbx](http://www.freepbx.org) - Web-based open source GUI that controls and manages Asterisk. ([Source Code](http://git.freepbx.org/projects/FREEPBX)) `GPLv2` `PHP`
+  * [FusionPBX](https://www.fusionpbx.com/) - An open source project that provides a customizable and flexible web interface to the very powerful and highly scalable multi-platform voice switch called FreeSWITCH. ([Source Code](https://github.com/fusionpbx/fusionpbx)) `MPLv1.1` `PHP`
   * [Kazoo](http://2600hz.org/) - KAZOO is an open-source, highly scalable software platform designed to provide carrier-grade VoIP switch functions and features. ([Source Code](https://github.com/2600hz/KAZOO)) `MPLv1.1` `Erlang`
 
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