IncrediblePBX

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  https://wiki.incrediblepbx.com/

Freedom to Communicate

Incredible PBX is an open source, GPL aggregation which bundles industry-leading components to provide a production-ready, turnkey unified communications VoIP platform with support for SIP and IAX. IncrediblePBX® includes a choice of Debian®, Rocky®, Ubuntu®, or Raspbian® operating systems coupled with the Apache® web server, PHP®, MariaDB®/MySQL® DBMS, Postfix® SendMail® or Exim® mail server, HylaFax®/AvantFax®, WebMin®, OpenVPN®, NeoRouter® VPN, IPtables firewall plus Fail2Ban® and PortKnocker®, and the latest releases of Asterisk® and FreePBX®.

The "Free" in FreePBX stands for Freedom. That's because FreePBX, the worlds most popular open source IP PBX, gives users the tools to build a phone system tailored to their needs.

Completely free to download and use, the power of FreePBX comes from a global community of developers who ensure it remains a high compatibility and customizable platform with all the key features needed to build a scalable business phone system on any budget.

With millions of installations worldwide and a very active development base, the FreePBX community continues to out-perform the telecom industry’s commercial efforts.

IncrediblePBX + FreePBX is free and open source – there are no limitations and you can inspect, integrate, extend and modify however you want.