VVX 310 vs VVX 311 — which should I buy?

The 311. It's the direct successor with a faster CPU and a current firmware track. Same exact chassis and layout. The 310 we carry only for fleet continuity with older deployments.

Does the VVX 311 have a color display?

No — it's a 208×104 greyscale LCD. The color version of the same chassis from this generation is the VVX 350 (which also adds USB and a refreshed processor).

Can I add an expansion module to the VVX 311?

Yes. The VVX Color Expansion Module (EXP 50) connects via the back RJ45 port and adds 28 multi-color line keys across three pages, for 84 keys per module. You can chain up to three modules off a single phone.

Does the VVX 311 have a USB port?

No. For USB headset or Wi-Fi dongle support, step up to the VVX 350 (same form factor, adds two USB ports plus a few other refinements).

Poly · VVX series · greyscale + gigabit refresh

Poly VVX 311A greyscale + gigabit refresh that just keeps working.

The VVX 311 is the direct successor to the VVX 310 — same six-line greyscale chassis with gigabit Ethernet, faster processor, refreshed firmware track. It's the current volume pick for a Poly receptionist phone where color isn't a requirement but you don't want a 100 Mbps choke point at the desk.

Display

3.5″ monochrome · 208×104

SIP accounts

6 lines

Ethernet

Dual gigabit

USB ports

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Bluetooth / Wi-Fi

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Expansion

VVX EXP 50

$159 one-time

or rent for $11.99/mo — month-to-month, return anytime

Ships pre-configured · free next-business-day for orders $200+

Order a VVX 311 Rent for $11.99/mo Datasheet (PDF) ↓

✓ Auto-provisioned out of the box ✓ Warranty replacement included with rental ✓ Free shipping on orders $200+

Poly VVX 311 VoIP desk phone — front view with handset and dialpad — Poly VVX 311

Why the VVX 311 is on the catalog.

The VVX 311 replaced the VVX 310 in 2017 as Poly's standard six-line greyscale gigabit phone. Same exact chassis, same screen, same line key layout. What changed was internal: a faster CPU, more RAM, refreshed UCS firmware track. If you have a 310 today, the 311 is its drop-in successor.

It's the phone we ship to small business reception desks where color isn't a priority but the phone shares a network drop with a workstation that needs full gigabit. Six SIP lines is usually enough for a one-person reception role; if you need more line keys for BLF monitoring, add a VVX EXP 50 sidecar — each module adds 28 multi-color keys across three pages.

Where it isn't the right phone: if anyone is using a USB headset, the 311 doesn't have a USB port — get the VVX 350 (same form factor, adds two USB ports) for about $20 more. If your team is visual learners and benefits from a color BLF label, the VVX 350 (color, gigabit, USB) is a strict upgrade.

Full technical specifications.

Display & user interface
Display	3.5-inch 208×104 monochrome backlit graphical LCD
Line keys	6 programmable line keys
Soft keys	4 context-sensitive soft keys under the display
Physical keys	Dialpad, hold, mute, transfer, headset, message, redial, volume, navigation
Languages	Multiple on-screen languages (English, Spanish, French, German, Portuguese, etc.)
VoIP & SIP
SIP accounts	Up to 6
SIP protocols	SIP v2 (RFC 3261), TLS / SRTP, NAT traversal, BLF / BLA, shared call appearance
Codecs	Opus, G.722, G.722.1, G.711a/μ, G.729AB, iLBC, Siren 14 / 22
DTMF	In-band, RFC 2833, SIP INFO
QoS	802.1p/Q VLAN tagging, DiffServ ToS, LLDP-MED
Audio
Speaker	Full-duplex with Polycom Acoustic Clarity (AEC, dynamic noise reduction)
HD voice	Polycom HD Voice on handset and speakerphone
Headset support	RJ9 headset jack, EHS via APP-51 adapter (sold separately)
Connectivity
Ethernet	Dual-port 10/100/1000 Mbps gigabit
PoE	IEEE 802.3af Class 2
USB	None
Bluetooth	Not supported
Wi-Fi	Not supported (USB dongle not officially supported)
Power & expansion
Power source	PoE 802.3af Class 2 (preferred) or Poly 5V/0.6A power adapter (sold separately)
Expansion module	VVX EXP 50
Physical
Weight	1.02 kg
Dimensions	248 × 178 × 165 mm
Wall-mountable	Yes
Operating temperature	0 to 40 °C (32 to 104 °F)
In the box (from voip.army)
Included	Handset, base unit, curl cord, ethernet cable, stand, quick-start card, voip.army provisioning card with extension & SIP credentials pre-loaded
Not included	Power adapter (PoE preferred), EHS adapter for wireless headsets, expansion module

How it works on voip.army.

Plug the VVX 311 into PoE and ethernet. About a minute later it has registered to your extension. Same auto-provisioning flow as every other supported phone — no SIP credentials to type, no firmware to chase.

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 6 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.

Ethernet to the workstation

Gigabit pass-through to a daisy-chained workstation — no bottleneck for big file transfers.

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USB headset ports

No USB. Wired RJ9 headset jack only (if equipped).

802.3af

PoE class

Class 2 on most VVX. Any standard 802.3af switch powers it; no separate adapter needed.

Need VVX 311s for every desk?

Tell us how many you need and what extensions to map. We ship pre-configured next business day; you plug them in and they work.

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✓ Free shipping on orders $200+ ✓ 30-day hardware return ✓ Pre-configured before shipping