Mô tả	SoundPoint IP 450
Product Specifications

Lines (direct numbers)	• Up to 3 lines with up to 8 concurrent calls per line

Display	• 256 x 116 pixel backlit grayscale graphical LCD • LED backlight with custom intensity control • Message Waiting Indicator (MWI) LED

Feature keys	• 4 context-sensitive “soft” keys • 17 dedicated “hard” keys • 3 line keys with bi-color (red/green) LED • 3 feature keys • 5 display/menu navigation keys • 2 volume control keys • Mute, headset and hands-free speakerphone keys • Dedicated hold key

Headset and hearing aid compatibility	• Dedicated RJ-9 headset port • Amplified headsets are recommended • Compliant with ADA Section 508 Recommendations: Subpart B 1194.23 (all) • Hearing Aid Compatible (HAC) handset for magnetic coupling to approved HAC hearing aids • Compatible with commercially-available TTY adapter equipment

Audio features	• Polycom HD Voice technology delivers life-like voice quality for each audio path – the handset, the hands-free speakerphone, and the optional headset1 • Full-duplex hands-free speakerphone • Type 1 compliant with IEEE 1329 full duplex standards • Comfort noise fill • DTMF tone generation/DTMF event RTP payload • Low-delay audio packet transmission • Adaptive jitter buffers • Packet loss concealment • Acoustic echo cancellation • Background noise suppression

Call handling features2	• Shared call/bridged line appearance • Flexible line appearance (one or more line keys can be assigned for each line extension) • Busy Lamp Field (BLF) • Distinctive incoming call treatment/call waiting • Call timer • Call transfer, hold, divert (forward), pickup • Called, calling, connected party information • Local three-way conferencing • One-touch speed dial, redial • Call waiting • Remote missed call notification • Intercom • Automatic off-hook call placement • Do not disturb function

Other features	• Integration with Microsoft LCS 2005 for telephone and presence3 • Compatibility with Microsoft Office Communicator and Windows® Messenger 5.1 Clients • 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