3 CO lines, 8 station ports (system or single line), with expansion up to 8 CO's and 24 station portsBuilt-In caller ID card (KX-TA62493-3) for CO's 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)Built-in modem cardBuilt-in USB and RS232C ports