programmable keys 3 dynamic context-sensitive softkeys- Auto-sensing Ether ports with integrated PoE- HD wideband audio superb full-duplex hands-free speakerphone with advanced acoustic echo cancellation and excellent double-talk performance- Support SIP (RFC3261) TCP/IP/UDP RTP/RTCP HTTP ARP ICMP DNS (A record and SRV) DHCP(both client and server) PPPoE TFTP NTP- Dual switched 10/100Mbps Ether ports w/integrated Power-over-Ether (802.3af)- Support NAT traversal (STUN etc) server fail-over SIP presence (SIMPLE) and more- Generous 240x120 pixel backlit graphical LCD display with up to 8 level grayscale- 6 lines indicators with individual SIP account profiles- 7 programmable hard keys and 4 XML programmable context-sensitive soft keys- Multi-line support of up to 13 call appearance lines with dual-color LED indicators- Expandable to additional 112 lines through expansion key-modules- Support Caller ID display or block per call or permanent- Call waiting hold mute transfer (blind or attended) forward and more- Multi-party conferencing (up to 5-way)- Full duplex speakerphone w/advanced audio echo cancellation- Headset jack (2.5 mm and RJ9) for broad headset patibility- Large phonebook (up to 2000 contacts) and call history (up to 2000 records)- Automated provisioning using TR-069 or encrypted XML configuration file SRTP and TLS for advanced security protection 802.1x for media access control- Automated personal information service (e.g. local weather stock currencies RSS news etc) personalized music ring tone/ring back tone/music-on-hold flexible customizable screen content & format using XML and advanced Web and enterprise applications integration (pending)- And many more enterprise grade features- SIP pliant and protocols - SIP TCP/IP/UDP RTP/RTCP HTTP ARP ICMP DNS (A record and SRV) DHCP PPPoE TFTP NTP etc.- Networking Interfaces - Dual 10/100mbps Ether ports- Codecs G.711 (a/u-law) G.723.1 G.729A/B G.726 iLBC and G.722 (wideband)- Superb Audio Quality - advance