The Millennium is an extremely flexible system that works as a PBX, key system, hybrid, tandem switch, channel bank, protocol converter, or conduit for data applications. The Millennium is digital end-to-end and Integrated Services Digital Network (ISDN) compatible on both the station side and network side. Digital capability, universal ports, highly adaptable programmability, and architectural flexibility are inherent in the system design. Regardless of utilized capacity, the system is non-blocking with consistent speech quality. The system's stored-program database contains a full complement of software feature applications.