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, Support up to 10 simultaneous calls. Juggle multiple calls easily with a single press of a button, Shared Call Appearances, Shared calls allow you to place a call on hold at one set and pick it up easily at another set, Remarkable Audio, Quality speakerphone with excellent voice clarity and delivery, Protect Your Investments, Firmware upgrades can be downloaded and installed in the field as standards develop and Protocols evolve, Less Wiring, Built in dual 10/100 switched Ethernet ports let you share a connection with your computer. Inline power support eliminates the need for a power adapter