SoundPoint IP 330 vs IP 331?

Minor firmware refresh and production changes — same chassis, same display, same line count, same audio. If you have a mixed fleet, they're interchangeable.

Is the SoundPoint IP 331 still supported on voip.army?

Yes — UCS firmware 4.0.15 on our legacy provisioning VLAN. Provisioning stays isolated because the phone can't speak modern TLS; call media is normal.

Will a 331 swap in cleanly for a failed 330?

Yes. Same provisioning template, same firmware, same dimensions and mounting. The user won't be able to tell the difference.

What's the modern equivalent?

The VVX 150 — current-gen two-line HD desk phone, supports Opus and the modern codec list, runs current UCS firmware on our main provisioning network.

Polycom · SoundPoint IP · legacy fleet

Polycom SoundPoint IP 331Still works. Still supported.

The SoundPoint IP 331 is the firmware-refreshed successor to the IP 330 — same two-line HD-voice chassis, slightly longer firmware support runway into the mid-2010s. EOL'd in 2015; still onboarded on voip.army for existing fleets.

Display

graphical LCD

SIP accounts

2 lines

Ethernet

Dual 10/100

Type

Desk phone

EOL year

2015

Condition

Refurbished / pre-owned

$59 refurbished

or rent for $7.99/mo — month-to-month, return anytime

Pre-owned, tested, re-flashed for voip.army — 30-day return

Order a SoundPoint IP 331 Rent for $7.99/mo Datasheet (PDF) ↓

✓ Auto-provisioned out of the box ✓ Warranty replacement included with rental ✓ 30-day return on refurbished

Polycom SoundPoint IP 331 VoIP phone — front view with handset and dialpad — Polycom SoundPoint IP 331

Why we still support the SoundPoint IP 331.

The SoundPoint IP 331 was a minor refresh of the IP 330 — same chassis, same display, same two-line layout, same audio path. The difference was a slightly extended firmware support window and minor production-process refinements. Released around 2010, EOL'd in 2015.

Mechanically and operationally it's interchangeable with the 330 on voip.army's legacy provisioning VLAN. If you have a fleet with a mix of 330s and 331s, they all run the same UCS 4.0.15 firmware and the same provisioning template.

For new orders we'd direct you at the current VVX 150 or VVX 250. The 331 is here for fleet continuity, not new buyer recommendations.

Full technical specifications.

Display & user interface
Display	Backlit 102×33 pixel monochrome graphical LCD
Line keys	2 line keys with dual-color LEDs
Soft keys	Context-sensitive under the display
VoIP & SIP
SIP accounts	2
SIP protocols	SIP v2 (RFC 3261), supported on voip.army's legacy provisioning VLAN with UCS firmware 4.0.15
Codecs	G.711, G.722, G.729AB, G.726, iLBC
Audio
Speaker	Full-duplex with Polycom Acoustic Clarity
HD voice	G.722 wideband on handset/speaker
Headset	RJ9 headset jack
Connectivity
Ethernet	Dual 10/100 Mbps
PoE	IEEE 802.3af Class 2
Power & physical
Power source	PoE 802.3af Class 2 (preferred) or Polycom power adapter (sold separately)
Weight	0.86 kg
Dimensions	240 × 200 × 90 mm
Wall-mountable	Yes
Lifecycle status
EOL year	2015
Firmware on voip.army	Polycom UCS 4.0.15 (legacy provisioning VLAN)
voip.army stock	Refurbished / pre-owned, tested and re-flashed

How it works on voip.army.

The SoundPoint IP 331 runs Polycom UCS firmware 4.0.15 — the last release that supports this hardware. It onboards onto voip.army the same way as any current phone, just on our legacy provisioning VLAN because the phone's TLS stack predates modern web standards. Call quality is normal SRTP.

60s

Time from plug-in to first call

Boot, fetch config from our provisioning server, register, ready. About one minute on a normal internet connection.

SIP accounts on one phone

Run up to 2 simultaneous SIP registrations. Each line key has a dual-color LED for status.

Per-device onboarding fees

Bringing your own? Send us the MAC, factory-reset, plug in. No charge to add it to the fleet.

4.0.15

UCS firmware version

Last firmware Polycom shipped for this phone (2018). Still works perfectly on voip.army; provisions over our isolated legacy VLAN because the phone can't speak TLS 1.2.

100m

Ethernet to the workstation

PC pass-through port on the back lets you daisy-chain a single ethernet drop to phone and computer.

802.3af

PoE class

Class 2. Any 802.3af-compliant switch from the last 15 years will power it without issue.

Onboarding a fleet of SoundPoint IP 331s?

Send us a CSV of MAC addresses. We add them to the provisioning server, you factory-reset and plug in, they pick up their voip.army config within a minute.

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