TI TITAN chipset and TI voice engine. 20 keys including 2 programmable keys. Voicemail, Speed dial, 3-way conferencing. Integrated voice response (IVR) system. Voice codec: G.722, G.711u/A, G.726, G.729AB, G.723.1. Auto provision via TFTP/FTP/HTTP/PnP. Volume control, Ringtone selection, Distinctive ringtone. 1xRJ45, 1xdual-color LED, Phone label. Power over Ethernet (PoE): IEEE 802.3af class 1. Desktop with footstand (detachable), Wall-mountable.