Each 480i CT base supports up to 4 cordless handsets - Eight-line backlit screen with six context sensitive softkeys provides more information and flexibility in call handling - Large storage for personal directory, callers log, and redial list - Support for multiple IP telephony systems including BroadWorks, Nortel, Sylantro, and Asterisk SIP - Supports up to 9 simultaneous calls (managed with call appearance lights). Juggle multiple calls easily with a single press of a button - Shared calls allow you to place a call on hold at one set and pick it up easily at another set - Quality speakerphone with excellent voice clarity and delivery - Firmware upgrades can be downloaded and installed in the field as standards develop and protocols evolve - Built-in dual 10/100 switched Ethernet ports let you share a connection with your computer. Inline power support eliminates power adapters