3 outside CO lines and 8 extensions, voice guidance, built-in voice message, direct inward system access with message, uniform call distribution with message, caller ID display on SLT and APT, flexible SMS routing, intuitive customization and maintenance, secret dialing, auto redial, call transfer, call waiting, pulse to tone conversion, station message, station hunting, door phones, door openers, and doorbells, PC programming and easy maintenance, CO busy out, budget management, call charge calculation.