Yealink's T21PN takes entry-level IP phones to a level never achieved before. Making full use of high quality materials, plus an extra large graphical LCD display, it offers a smoother user experience, much more visual information at a glance plus full support for HD voice. Dual 10/100 Mbps network ports with integrated PoE enable extended network use. The T21PN supports two VoIP accounts, simple, flexible and secure installation options, plus support for IPv6, Open VPN and back-up redundancy server. It also operates with SRTP/HTTPS/TLS and 802.1x.