Feature●The phone only works with VoIP●2 dual-color line keys (with 2 SIP accounts and up to 2 call appearances), 3 XML programmable context-sensitive soft keys, 3-way conference●HD wideband audio, superb full-duplex hands-free speakerphone with advanced acoustic echo cancellation and excellent double-talk performance.●Large phonebook (up to 500 contacts) and call history - up to 200 records●Automated provisioning using TR-069 or encrypted XML configuration file, SRTP and TLS for advanced security protection, 802.1x for media access control●13248 pixel backlit graphical LCD display.Description The GXP1620/1625 is Grandstreams standard IP phone for small businesses. This Linux-based model features 2 lines, 3 XML programmable soft keys, HD audio and 3-way conferencing. A 132x48 LCD screen creates a clear display for easy viewing. Both the GXP1620 andGXP1625 include dual 10/100mb network ports and the GXP1625 includes integrated PoE. Additional features such as multi-language support, Electronic Hook Switch support for Plantronics headsets and call-waiting allow the GXP1620 and GXP1625 to be high quality, user-friendly and dependable IP phones.