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ADTRAN IP 550
Exceptional sound quality and advanced
features in a four-line SIP phone
Product Specifications
Lines (Direct Numbers)
Up to 4 lines with up to 24 concurrent calls
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Display
320 x 160 backlit grayscale graphical LCD
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White LED backlight with custom intensity control
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Message Waiting Indicator (MWI) LED
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Feature Keys
4 context-sensitive "soft" keys
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26 dedicated "hard" keys
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6 line keys with bi-color (red/green) LED
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8 feature keys
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6 display/menu navigation keys
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2 volume control keys
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Illuminated mute key
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Illuminated headset key
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Illuminated hands-free speakerphone key
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Dedicated hold key
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Headset and Hearing Aid Compatibility
Compliant with ADA Section 508
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Recommendations: Subpart B 1194.23 (all)
Hearing Aid Compatible (HAC) handset for
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magnetic coupling to approved HAC hearing aids
Compatibility with commercially-available TTY
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adapter equipment
Audio Features
HD Voice technology delivers life like voice quality
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for each audio path - the handset, the hands-free
speakerphone, and the headset
Full-duplex hands-free speakerphone
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Type 1 compliant with IEEE 1329 full duplex standards
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Frequency response - 150Hz - 7kHz for handset,
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headset1 and hands-free speakerphone modes
Codecs: G.722 (wideband), G.711 μ/A, G.729A
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(Annex B), and iLBC
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
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can be assigned for each line extension)
Busy Lamp Field (BLF)
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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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1.5
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