This Linux-based model offers 2 lines, 3 programmable XML keys, HD audio and 3-way conference. A 132 x 48 LCD screen creates a clear image for easy viewing. Both the GXP1620 and the GXP1625 include dual 10 / 100mb network ports. Additional features such as multilanguage support, Electronic Hook Switch support for Plantronics hearing aids and call waiting allow you to be reliable, easy-to-use and high-quality IP phones. PoE.