The SIP phone GRANDSTREAM GXP-2140 Supports 4 lines, 4 SIP accounts and 5-way voice conferencing HD audio on speakerphone and handset 5 programmable context-sensitive soft keys Compatible with GXP2200 LCD extension module (GXP2200 EXT) 4.3 inch (480×272) color-screen LCD Dual Gigabit ports, integrated PoE Integrated Bluetooth for use with Bluetooth headsets and Bluetooth-enabled mobile devices (transferring contact books and calls) USB