The Aastra 571i CT IP Phone is a Full Duplex speakerphone with multi line capabilities, a large 144x128 backlit graphical LCD screen , programmable keys and XML Browser Capabilities. The 57i CT includes and integrated DECT cordless phone for complete mobility. The Aastra 57i CT has 4 fixed Call Appearance keys and 12 Self Labeling programmable keys with LEDs. No more paper designation labels! The 12 programmable buttons allow you to setup features, functions or station appearances. With a glance you can see who's on the phone and what features are active. Designed for the Aastra Pro 160 or any standards based SIP telephone application. When used with the Aastra pro 160 system installation is as simple as plugging it into your network. The system will automatically find the aastra Pro 160 and set itself up. You enter your extension number and password, and you can start using the phone instantly If you are looking for a advanced Multi line IP phone with lots of softkeys then the Aastra 57i CT IP Phone is your choice.