6-line color display IP phone with HD Voice , Da , Da , Da , Message Waiting Indicator (MWI) LED , 320 x 160 backlit color graphical LCD , LED backlight with custom variable intensity control , Event logging , Voice activity detection , QoS Support – IEEE 802.1p/Q tagging (VLAN), Layer 3 TOS, and DSCP ,  Frequency response - 150Hz - 7kHz for handset, F headset1 and hands-free speakerphone modes , Time and date synchronization using SNTP , The PSU version supports up to three Color Expansion Modules , Support for URL syntax with password for boot server , Compatibility with commercially-available TTY adapter equipment , Conformant to IEEE802.3-2005 (Clause 40) for Physical Media Attachment , Up to 47 remote party BLF line monitors , Encrypted configuration files , Headset and Hearing Aid Compatibility : Dedicated RJ-9 headset port -- Amplified headsets are recommended , Background noise suppression , Lines (Direct Numbers) : Up to six lines (standalone mode) , Security : Transport Layer Security (TLS) , Adaptive jitter buffers , Local digit map , Comfort noise fill , Network Address Translation (NAT) support – static , Codecs: G. 722 (wideband), G. 71 μ/A, G. 729A 1 (Annex B), and iLBC , FTP/TFTP/HTTP/HTTPS4 server-based central provisioning for mass deployments. Provisioning server redundancy supported , HTTPS secure provisioning , Audio Features : Polycom HD Voice technology delivers life-like voice quality for each audio path - the handset, the hands-free speakerphone, and the headset , Conformant to IEEE802.3-2002 (Clause 28) for Link Partner Auto-Negotiation , Up to 34 SIP registrations , Digest authentication , Compliant with ADA Section 508 Recommendations: Subpart B 1 194.23 (all) , Protocol Support : IETF SIP (RFC 3261 and companion RFCs) , Up to 24 concurrent calls , Secure Real-time Transport Protocol (SRTP) , Packet loss concealment , Hardware diagnostics , DTMF tone generation/DTMF event RTP payload , Network Address Translation (NAT) support – static , Individual volume settings with visual feedback for each audio path , Web portal for individual unit configuration , Support for signed software executables , Full-duplex hands-free speakerphone -- Type 1 compliant with IEEE 1329 full duplex standards , Manual or dynamic host configuration protocol (DHCP) network setup , SoundPoint IP Color Expansion Module Support : The PoE version supports one Color Expansion Module , Password login , Hearing Aid Compatible (HAC) handset for magnetic coupling to approved HAC hearing aids , Network and Provisioning : Two-port Gigabit Ethernet switch:10/100/1000Base-Tx across LAN and PC ports , Expansion Module Mode : Up to 48 line keys/appearances , Shipped with X. 509 certificate installed , Acoustic echo cancellation , Status and statistics , Low-delay audio packet transmission , One-touch speed dial, redial , Call transfer, hold, divert (forward), pickup , Busy Lamp Field (BLF) , Automatic off-hook call placement , Call waiting , Called, calling, connected party information , Distinctive incoming call treatment/call waiting , Shared call/bridged line appearance , Do not disturb function , Remote missed call notification , Local three-way conferencing , Call timer , Flexible line appearance (one or more line keys can be assigned for each line extension) , Intercom , 26.5 cm x 15 cm x 19 cm x 6.5 cm , Built-in, auto-sensing IEEE 802.3af Power over Ethernet , External Universal AC adapter (included 48V DC) , Wave file support for call progress tones , 8 feature keys , Time and date display , Support for Full-speed and Low-speed peripherals , Integration with Microsoft LCS 2005 for telephone and presence : Compatibility with Microsoft Office Communicator and Windows Messenger 5.1 Clients Universal Serial Bus (USB) , Illuminated headset key , Unicode UTF-8 character support. Multilingual user interface encompassing Chinese, Danish, Dutch, English (Canada/US/UK), French, German, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Slovenian, Spanish, Swedish , 6 display/menu navigation keys , User-configurable contact directory and call history (missed, placed, and received) , Feature Keys : 4 context-sensitive soft keys , Type-A receptacle interface , Full Host Controller , Illuminated hands-free speakerphone key , 2 volume control keys , Customizable call progress tones , 26 dedicated hard keys : 6 line keys with bi-color (red/green) LED , Local feature-rich GUI , Compliant with OHCI 1.1 specification , Other Features : Enabled for the Polycom Productivity Suite , Dedicated hold key , Illuminated mute key - 1000001627


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