Aastra 480i CT IP Phone Cordless Mobility  Built-in WDCT technology provides up to 300,000 sq. ft. of coverage without the need for a separate wireless network Large Base Unit Display  Eight-line backlit screen with six context sensitive softkeys provides more information and flexibility in call handling Enhanced Call Management  Large storage for personal directory, callers log, and redial list Tight Integration  Support for multiple IP telephony systems including BroadWorks, Nortel, Sylantro, and Asterisk SIP Multiple Line/Call Appearance Lights  Supports up to 9 simultaneous calls. Juggle multiple calls easily with a single press of a button