The X4 is a feature-rich sip phone for business. The 4-Line IP Phone has been designed by pursuing ease of use in even the tiniest details. Dual 10/100 Mbps(X4G: 10/100/1000 Mbps) network ports with integrated PoE are ideal for extended network use. Delivering a superb sound quality as well as rich visual experience. With second DSS color screen, the IP Phone supports up to 30 DSS keys which improve work efficiency. Using standard encryption protocols to perform highly secure remote provisioning and software upgrades.