If you need to use virtual machines on Linux, try Virt-Manager. Virt-Manager is more reliable than VirtualBox. Virt-Manager is completely free and open-source. I'm a long-time supporter of VirtualBox.
Altitude Software, a provider of unified customer interaction solutions, today released Altitude vBox 5, an enterprise-grade SIP server for contact centers. Altitude vBox is based on open-source ...