Spotted in the host stand at Harry Caray’s at Midway is a Nortel Norstar set. They must have a very large Norstar system in this airport as the whole airport uses Norstar phones. Maybe it’s a large cics or BCM450 switch.
The T7316E set is part of the newer generation of Norstar telephones developed in 1999 for the release of the Enterprise Edge first generation IP BCM system. This set is generally used by admins, managers and customer service desks.