The Fanvil X5U dual color LCD IP Phone supports 16 SIP lines with 4 line keys on the main display. The Fanvil X5U includes a host of great features, like built-in Bluetooth, dual-color LCDs, and Harman speaker which you typically won't find at this price point.  Moreover, the Fanvil X5U supports the Opus codec and has HD audio on both the handset and speakerphone so that you can be sure all calls will be clear and crisp.