The Nortel Networks T7316E is a full-featured, expandable, multi-line telephone that is designed for supervisors, managers, executives, and other business professionals. 2 line x 16 character LCD tiltable display 24 fully programmable buttons (16 support LCD indicators) Integrated headset interface Message waiting indicator/Visual ringing lamp 3 display soft keys Hold, release, active handsfree, and feature button Compatible with all releases of Norstar CICS and MICS and all releases of Nortel BCM CICS/MICS R 6.1 software or higher is required to program lines for all 16 LCD indicator buttons; earlier versions of software support up to 10 line appearances T24 KIM supported on CICS/MICS R 6.1 or higher, BCM 3.5 or higher Also compatible with IP Office and IP Office Quick Version equipped with IP500 TCM 8, IP500 Digital Station 16A, or IP500 Digital Station 30A