Voximal allows you to create voice portals with VoiceXML language to interact with humans through phone calls. It is integrated with Asterisk, and FreePBX core softwares. The core telephony software is Asterisk, the open source PBX. Web GUI is the popular FreePBX, propulsed by LAMP (Linux,Apache,Mysql,PHP). Mission critical software Voximal, is free and full featured for one channel.