The Norstar M7324 Executive Telephone is an expandable, feature-rich telephone supporting heavy call volumes. The Norstar M7324 is ideal for administrative assistants, receptionists, and other centralized call answering personnel. By attaching up to two Key Lamp Modules (KLM), an additional 96 memory buttons can be added, creating a total combination of 120 lines, features, or autodials. This phone requires a Nortel PBX system to operate.