Open-Xchange, a provider of business-class open source collaboration software, today announced enhancements that give users telephone and fax integrated with e-mail, contacts, calendar and task information. By combining Open-Xchange (hosted and on-premise editions) with Unified Communications and Virtual PBX solutions, businesses can replace their traditional phone lines -- saving on phone bills. Presence and instant messaging services will be added in the coming software releases enabling users to communicate in real-time anytime, anywhere.