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ADTRAN IP 321
Enterprise Grade SIP Phone for Remarkable Value
Product Specifications
Lines (Directory Numbers)
Up to 2 lines with up to 8 simultaneous calls
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Display
102 x 33 pixel-graphical LCD
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Message Waiting Indicator (MWI) LED
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Feature Keys
3 context-sensitive "soft" keys
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2 line keys with bi-color (red/green) LED
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2 feature keys ("Menu" and "Dial")
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4-way navigation key cluster with center "Select" key
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2 volume control keys
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Dedicated hold key
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Dedicated headset key
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Dedicated hands-free speakerphone key
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Optional Messages Key
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Dedicated microphone mute key
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Dedicated 2.5-mm headset port compatible with most
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monaural mobile phone headsets
Headset and Hearing Aid Compatibility
Compliant with ADA Section 508
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Recommendations: Subpart B 1194.23 (all)
Headset Compatibility
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Hearing Aid Compatible (HAC) handset for magnetic
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coupling to approved HAC hearing aids
Compatible with commercially-available TTY
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adapter equipment
Audio Features
Full-duplex hands-free speakerphone with
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ADTRAN
Acoustic Clarity Technology
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Type 1 compliant with IEEE 1329 full
o
duplex standards
Frequency Response: 300Hz - 3300Hz for handset,
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headset and hands-free speakerphone modes
Codecs: G.711 μ/A, G.729A (Annex B), and iLBC
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Individual volume settings with visual feedback for
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each audio path
Voice activity detection
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Comfort noise fill
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DTMF tone generation/DTMF event RTP payload
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Low-delay audio packet transmission
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Adaptive jitter buffers
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Packet loss concealment
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Acoustic echo cancellation
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Background noise suppression
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Call Handling Features
1
Shared call / bridged line appearance
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Flexible line appearance (one or more line keys can
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be assigned for each line extension)
Distinctive incoming call treatment/call waiting
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Call timer
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Call transfer, hold, divert (forward), pickup
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Called, calling, connected party information
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Local three-way conferencing
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One-touch speed dial, redial
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Call waiting
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Remote missed call notification
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Intercom
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Automatic off-hook call placement
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Do not disturb function
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