Callisto is the central unit of your future corporate communications infrastructure. It represents the pivotal point between your PABX and IT, or the Internet/Intranet. The Callisto base system satisfies basic requirements such as voicemail service, Unified Messaging, and directory services. Many additional services such as fax or virtual conference rooms can be added individually on demand. This future-safe, modular architecture protects your Callisto investment. Since CTMaker forms the basis of Callisto, it facilitates the speedy and cost-effective creation of additional custom-made solutions.
Callisto offers two user interfaces for operation: a web-based graphical user interface and a telephony interface.

Callisto is provided ready-to-operate as a hardware appliance (standard system and 19" rack version) and as virtual appliance.