SoundPoint IP 320 vs SoundPoint IP 321 — difference?

The 321 added IEEE 802.3af PoE Class 2 power and HD Voice (G.722). The original 320 ran on a Polycom-specific PoE variant that wasn't fully standards-compliant. If you're sourcing used, get the 321.

Is the SoundPoint IP 320 still supported on voip.army?

Yes — on our legacy provisioning VLAN running UCS firmware 4.0.15. The phone can't speak TLS 1.2, so provisioning stays on an isolated network, but call functionality is normal.

Can I buy a SoundPoint IP 320 new?

No — Polycom EOL'd it in 2014. Our stock is refurbished/pre-owned. For new equivalent functionality look at the VVX 150.

Does the SoundPoint IP 320 support HD voice?

No — the original 320 predates HD voice on SoundPoint. The IP 321 added G.722 HD support, and the 330 / 331 / 335 series all have HD voice.

Polycom · SoundPoint IP · legacy fleet

Polycom SoundPoint IP 320Still works. Still supported.

The SoundPoint IP 320 is the small-footprint two-line variant Polycom shipped in the late 2000s — same display class as the 301, slightly smaller chassis. EOL'd in 2014, still supported on voip.army for customers running existing fleets.

Display

graphical LCD

SIP accounts

2 lines

Ethernet

Dual 10/100

Type

Desk phone

EOL year

2014

Condition

Refurbished / pre-owned

$45 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 320 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 320 VoIP phone — front view with handset and dialpad — Polycom SoundPoint IP 320

Why we still support the SoundPoint IP 320.

The SoundPoint IP 320 was the compact two-line phone in the SoundPoint family — same monochrome display as the 301, slightly smaller chassis, marketed as a desk-friendly option for cubicles and hot-desk setups. Released 2007, EOL'd 2014.

Where the 301 came in a full-sized SoundPoint footprint, the 320 was designed to fit on cramped desks. Functionally the two are near-identical: two SIP lines, full-duplex speakerphone, RJ9 headset jack. Same firmware, same provisioning flow, same audio path.

For existing fleets, the 320 onboards onto voip.army's legacy provisioning VLAN running UCS 4.0.15. If you have spares and a deployment that's working, there's no reason to retire them. For new orders, the modern equivalent is the VVX 150 or VVX 250 — both add the modern codec list (Opus) and run the current UCS firmware track.

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.729AB, G.722, 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 320 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 320s?

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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