CTModule’s "Callisto mobile" application allows users of CTModule’s enterprise communications solution and Unified Communications platform “Callisto” both the implementation of a “OneNumber” concept, as well as the monitoring of all mobile users via the CTModule Callisto Operator Console "COC". With the “Callisto mobile” application, users can easily access existing phone contacts and dial it with his/her own phone number password-secured over company’s Callisto system for outgoing calls. The Callisto Operator Console "COC" recognizes the status of the mobile users automatically.