Open Minded Telecom System.

XiVO is an IP-PBX, a system that connects phones inside an organization with public and mobile telephone networks. An IP-PBX is a PBX that provides audio, video, and instant messaging services through the TCP/IP protocol.

AstLinux is a "Network Appliance for Communications" open-source x86_64 Linux software distribution. Unified communications including voice, presence and messaging. Network routing, stateful filtering firewall and VPN support. AstLinux's framework allows integrators and developers to deploy solutions that may be remotely monitored, supported and upgraded using an optimized 60 MB compressed image.