Sangoma's PBXact UC phone systems are based on FreePBX, which is the world's most popular open source phone system with over 2 million active installations and tens of millions of users. PBXact UC has a range of systems to match customer requirements and has been designed with the end user in mind therefore requiring little or no training. The PBXact UC phone systems support 25 to 5000 users and are designed for businesses needing a fully featured, commercially supported, communication solution.