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Poly SoundPoint IP 321 and 331 Desktop Phone

This is an end of life product – Please contact our sales team for the up to date models.

The SoundPoint IP 321 and 331 are two-line SIP phones that deliver superb sound quality as well as a wide range of supported business telephony features. The SoundPoint IP 321 phone has a single 10/100 Ethernet port and is designed for common areas, such as lobbies, hallways, and break rooms, as well as various wall-mounted deployments. The SoundPoint IP 331 phone, with its dual-port 10/100 Ethernet switch for LAN and PC connection, presents a cost-effective solution for cubicle workers as well as call center operators who use a “hard” phone in conjunction with a “soft” client running on the PC.


 Superb voice quality, enterprise grade feature set and business telephony features

The SoundPoint IP 321 and 331 phones feature a full-duplex IEEE 1329 Type 1-compliant speakerphone with Poly’s legendary Acoustic Clarity Technology that delivers excellent sound quality and enables noise-free and echo-free conversations that are as natural as being there.

The SoundPoint IP 321 and 331 phones deliver through an intuitive user interface a full feature set encompassing both traditional business telephony features such as call hold, park, pick-up, transfer, and three-way local conferencing, and more advanced capabilities such as shared call/bridged line appearance, hosts built-in XML microbrowser, and distinctive call treatment.

In today’s Internet driven world, the ability to conduct real time communication and collaboration has become critical to an organizations survival. As the market leader in voice, video, data and Web solutions, our award-winning IP telephony and conference technology makes it easy for people to interact and maximize productivity over any network, in just about an environment, anywhere around the globe. That’s why more organizations worldwide use and prefer Poly IP telephony and application solutions. Because when people work together, great things happen. See how you, too, can achieve great things with the Poly SoundPoint IP 321 and 331 desktop phones.


  • Two lines
  • Full duplex IEEE 1329 Type 1-compliant speakerphone with Clarity by Poly acoustic technology
  • 102 x 33 pixel graphical LCD
  • Integrated 802.3af PoE support
  • Two port 10/100 Ethernet switch – SoundPoint 331 (Single 10/100 Ethernet port – SoundPoint IP 321)
  • Small footprint

Lines (Directory Numbers)
Up to 2 lines with up to 2 calls per line

102 x 33 pixel-graphical LCD

Feature Keys
3 context-sensitive "soft" keys
2 line keys with bi-color (red/green) LED
2 feature keys ("Menu" and "Dial")
4-way navigation key cluster with center "Select" key
2 volume control keys
Dedicated hold key
Dedicated headset key
Dedicated hands-free speakerphone key
Dedicated microphone mute key
Headset Compatibility
Dedicated 2.5-mm headset port compatible with most monaural mobile phone headsets

Hearing Aid Compatibility
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
Full-duplex hands-free speakerphone with Poly
Acoustic Clarity Technology --Type 1 compliant with IEEE 1329 full duplex standards
Frequency response - 300Hz - 3300Hz for handset, headset and hands-free speakerphone modes
Codecs: G.711 µ/A and G.729A (Annex B)
Individual volume settings with visual feedback for each audio path
Voice activity detection
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 Features
Shared call / bridged line appearance
Flexible line appearance (one or more line keys can be assigned for each line extension)
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
Automatic off-hook call placement
Do not disturb function

Other Features
Interoperability with Microsoft® LCS 2005 for telephony and presence3 --Compatibility with Microsoft Office Communicator and Windows® Messenger 5.1 Clients

Other Features
Interoperability with Microsoft® LCS 2005 for telephony and presence3 --Compatibility with Microsoft Office Communicator and Windows® Messenger 5.1 Clients
Enabled for Poly Productivity Suite
Local feature-rich GUI
Time and date display
User-configurable contact directory and call history (missed, placed and received)
Wave file support for call progress tones
Unicode UTF-8 character support. Multilingual user interface encompassing Danish, Dutch, English (Canada/US/UK), French, German, Italian, Norwegian, Russian, Spanish, Swedish

Protocol Support
IETF SIP (RFC 3261 and companion RFCs) Network and Provisioning
SoundPoint IP 331 – two-port 10/100 Mbps Ethernet switch
SoundPoint IP 321 – single 10/100 Mbps

Ethernet port
Manual or dynamic host configuration protocol (DHCP) network setup
Time and date synchronization using SNTP
FTP / TFTP / HTTP / HTTPS server-based central provisioning for mass deployments
Provisioning and call server redundancy supported
Web portal for individual unit configuration
QoS Support – IEEE 802.1p/Q tagging (VLAN), Layer 3
Network Address Translation (NAT) support for static configuration and "Keep-Alive" SIP signalling
RTCP support (RFC 1889)
Event logging
Local digit map
Hardware diagnostics
Status and statistics reporting
Transport Layer Security (TLS)
Encrypted configuration files
Digest authentication
Password login
Support for URL syntax with password for boot server
HTTPS secure provisioning
Support for signed software executables

Built-in, auto-sensing IEEE 802.3af Power over Ethernet (Class 1)
External universal input AC adapter (optional4;24V DC @ 500mA)

FCC Part 15 (CFR 47) Class B
ICES-003 Class B
EN55022 Class B
CISPR22 Class B
VCCI Class B
EN55024 Class B
EN61000-3-2; EN61000-3-3; EN-61000-6-1
ROHS compliant

CE Mark
EN 60950-1
IEC 60950-1
CAB/CSA-C22.2 No. 60950-1-03
AS/NZS 60950-1

Operating Conditions
Temperature: 0 to 40°C (+32 to 104°F)
Relative Humidity: 5% to 95%, non-condensing

Storage Temperature
-40 to +70°C (-40 to +160°F)

SoundPoint IP 331/321 Comes With:
SoundPoint IP 331/321 console
Handset with handset cord
Base stand
Network (LAN) cable
Quick Start Guide
Product registration card

6.7 in x 5.7 in x 6.9 in x 1.4 in
(17 cm x 14.5 cm x 17.5 cm x 3.5 cm)

Weight Phone weight: 1.37 lb (0.625 kg)

Part Numbers / UPC Codes SoundPoint IP 331
2200-12365-025/610807694694 for all markets SoundPoint IP 321
2200-12360-025/610807690276 for all markets

Unit Box Dimensions / Weight
10 in x 4.2 in x 11.6 in (W x H x D)
(25 cm x 10.5 cm x 29.5 cm)
3 lb 4 oz (1.49 kg)

Master Carton Quantity

Country of Origin

1 year

Size (H x W x D)
Handset: 19.05 x 5.08 x 1.91 cm (7.5 x 2.0 x 0.75 in)
Cradle: 8.89 x 13.97 x 12.7 cm (3.5 x 5.5 x 5.0 in)

Unit: 1.10 kgs (2.43 lbs)
Handset: 0.21 kgs (0.45 lbs)
Shipping Weight: 1.10 kgs (2.43 lbs)

Supply voltage 5V provided by USB connection
Power consumption 500 mA

Device to PC Interface
USB 2.0
Captive 6.56 feet (2.0 m) USB cable

Device Controls and Keypad
4x3 dialpad
Redial key
Flash Key
Delete Key
Mute/unmute key
Speaker on/off key
Handset/headset key
Volume up/down key

LED Indicators
Off hook indicator
Voice messaging indicator
Speakerphone indicator
Headset indicator
Call forwarding indicator
Multi-colour LED presence indicator

Frequency response: 200Hz - 7kHz
> 58 dB
Dynamic range: >80 dB (@ 1kHz)
Total Harmonic Distortion + Noise: <3% (@ 1kHZ)

Auxilliary Audio Output
RJ9 headset jack with built-in amplifier

Audio Enhancements
Automatic Gain Control
Dynamic Noise Reduction
Acoustic Echo Cancellation
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