Zultys Technologies is truly raising the bar on VoIP business phones. Their latest corporate style VoIP phone, the ZIP 4x4L is the first in the family of an all new design. The family offers exceptional acoustic quality with full-duplex speaker phone, large LCD screens, and all the features you expect from modern VoIP business phones. The ZIP 4x4L has a large backlit monochrome LCD, a line-rate switch with four external Ethernet ports, and four call appearances. It has AES encryption, single button functions, 3.5 mm headset jacks, Power over Ethernet, message waiting indicator, QoS support, and a calculator.