Panasonic KX-TA824 Advanced Hybrid Analog Telephone System Control Unit3 CO lines, 8 station ports (system or single line), with expansion up to 8 COs and 24 station ports Built In caller ID card (KX TA62493 3) for COs with call waiting PC programmable system (on site and remote) 3 voice mail options (APITS, CO based or internal VM card) Direct inward system access with fax detection and 3 level auto attendant OGM (180 sec, 1 ch) Panasonic advanced hybrid telephone system with 3 CO's and 8 stations Expandable to 8 CO's