XiVO is an application suite developed by Avencall Group, based on several free existing components including Asterisk, and our own developments to provide communication services (IPBX, Unified Messaging, ...) to businesses.
XiVO is free software. Most of its distinctive components, and XiVO as a whole, are distributed under the GPLv3 license.
You may also check the XiVO blog for more information.
XiVO documentation is also available as a downloadable HTML, EPUB or PDF file. See the downloads page for a list of available files or use the menu on the lower right.