Aastra 6755i / 55i Brand New Includes One Year Warranty, The Aastra 6755i offers powerful features and flexibility in a standards based, carrier-grade advanced level expandable IP telephone. With a sleek and elegant design, 144 x 75 pixel backlit LCD display and 6 dynamic context-sensitive softkeys, the 6755i is fully interoperable with leading IP Telephony platforms. This system offers advanced XML capability to access custom applications and can support up to 9 calls simultaneously. The 6755i is ideally suited for moderate to heavy telephone users who require more one touch feature keys and XML based programs. 6755i Features: Multi-Proxy Support, Distinctive Ringing, Hi-Q & trade Audio Technology, Corded Voice Over IP Phone, Voice Over Internet Protocol (VoIP), Session Initiation Protocol (SIP), XML Browser, Up to 9 Call Appearance Lines, Caller ID / Call Waiting, Modular Headset Connector With Built-In Amplifier, Expandable Up To 3 Modules, Hearing Aid Compatible, Digital Duplex Speakerphone, 144x75 Graphical LCD Display Soft White Backlight For User ComfortIn Any Lighting Environment, LED For Call & amp Message Waiting Indicator, Phone Directory / Dialer, Call Log, 3-Way Conferencing, Call Forwarding, Missed Call Indicator, Wall Mountable/Mount Included, Intercom, Call Transfer, Paging Key, Auto Answer, Redial, Live Dialpad Option, Date / Time Display, Do Not Disturb, Call Timer, AC Powered (Adapter Included), Integrated IEEE 802.3af Power OverEthernet (PoE) Support, Multilingual Menu Support (English, French, Spanish, Italian, & amp German), Busy Lamp Field, VoIP Features: Dual 10/100 Mbps Switched Ethernet Ports, Manual or DHCP IP Address Setup, Time / Date Synch Using SNTP, NAT, QOS, TOS, & Differentiated Services Code Point, Built-In HTTP/HTTPS Server For Web Administration & Maintenance, Voice Codec Support: G.711 -law / A-law, G.729, Protocols: IETF SIP (RFC3261 & Associated RFCs) The 6755i IP Phone requires the following environment: SIP-based IP PBX system or network installed and running with a SIP account created for the 6755i phone. Access to a Trivial File Transfer Protocol (TFTP), Fi