The Nortel NT7B58AAAN Compact ICS telephone system "CICS" is packed with well over a hundred powerful features, like an integrated Automated Attendant which easily answers your calls and routes them to the right person or group. And if you equip your Norstar Compact ICS CICS with Calling Line Identification (CLID) and subscribe to the service from your local telephone company, your Norstar telephone LCD Window shows you the number (and name, where available) of the person calling. This convenient feature means you decide whether to take the phone call or return it later with the simple touch of a key.