What did the SoundPoint IP 321 fix compared to the 320?

Two things: HD voice (G.722 wideband codec support), and standards-compliant IEEE 802.3af PoE instead of the original 320's proprietary PoE variant. Same chassis, same screen, same line count.

Is the SoundPoint IP 321 still supported on voip.army?

Yes — on our legacy provisioning VLAN running UCS firmware 4.0.15. Provisioning traffic stays isolated because the phone can't speak modern TLS, but call media (SRTP) and SIP signaling are normal.

Will the SoundPoint IP 321 work on a modern PoE switch?

Yes — IEEE 802.3af Class 2. Any 802.3af-compliant switch from the last fifteen years will power it without issue.

What's the modern equivalent?

The Poly VVX 150 — entry-tier two-line desk phone, current firmware track, G.722 + Opus codec support, RJ9 headset jack.

Polycom · SoundPoint IP · legacy fleet

Polycom SoundPoint IP 321Still works. Still supported.

The SoundPoint IP 321 is the HD-voice refresh of the IP 320 — same compact two-line chassis, but with G.722 wideband audio and standards-compliant 802.3af PoE. EOL'd in 2014; still supported on voip.army's legacy provisioning VLAN.

Display

graphical LCD

SIP accounts

2 lines

Ethernet

Dual 10/100

Type

Desk phone

EOL year

2014

Condition

Refurbished / pre-owned

$49 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 321 Rent for $7.99/mo Datasheet (PDF) ↓

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Polycom SoundPoint IP 321 VoIP phone — front view with handset and dialpad — Polycom SoundPoint IP 321

Why we still support the SoundPoint IP 321.

The SoundPoint IP 321 fixed the two main complaints about the IP 320: it added G.722 HD voice support and switched from Polycom's proprietary PoE variant to standards-compliant IEEE 802.3af Class 2 power. Same chassis, same screen, same two-line layout — just usable with modern PoE switches and noticeably better audio quality on calls between two HD-capable endpoints.

Released 2008, EOL'd 2014. Still in heavy production use at customers who deployed in the late 2000s and never had a failure rate that justified replacement. On voip.army we provision it via the legacy VLAN running UCS firmware 4.0.15.

For existing fleets: bring the MACs, factory-reset, plug into PoE. For new orders the modern equivalent is the VVX 150 or VVX 250.

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	0.79 kg
Dimensions	208 × 183 × 70 mm
Wall-mountable	Yes
Lifecycle status
EOL year	2014
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 321 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 321s?

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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