FreePBX is an extremely easy to use graphic user interface (GUI) that is used for controlling and managing the highly popular open source telephony software ‘Asterisk’. FreePBX is a result of extreme hard work bestowed by thousands of volunteers. FreePBX is developed gradually with the course of time. So far, FreePBX has been downloaded more than 5,000,000 times. You can gauge the popularity of FreeePBX with aforementioned statistics. And, as per the rough estimate, at present there are more than 5,000,000 FreePBX enabled phone system.