Yealink SIP-T31G Gigabit IP Phone with 2 Lines & HD voice Yealink HD Voice 2.3r 132x64-pixel graphical LCD with backlight Dual-port Gigabit Ethernet PoE support Opus codec support Up to 2 SIP accounts Local 5-way conferencing Support EHS Wireless Headset Unified Firmware Support YDMP/YMCS Stand with 2 adjustable angles Wall mountable