Does the GXP1620 have PoE?

No. PoE is on the GXP1625 — same phone with PoE added for about $5 more. We almost always recommend the GXP1625 over the GXP1620 for that reason.

How big is the screen?

180 × 90 pixels, backlit monochrome LCD. About 50% more readable area than the GXP1610's 132×48 panel.

Does it support Opus?

No. G.722 is the best codec it speaks. For Opus, look at the GRP2603 or newer GRP-series phones.

Limited. Two line keys, both usually consumed by your SIP lines. For real BLF (4+ buddy keys), step up to the GXP1628 or GXP1630.

Grandstream · GXP series · legacy entry plus

Grandstream GXP1620Bigger screen, two real lines.

Two SIP accounts, a 180×90 backlit LCD (bigger than the GXP1610), dual 10/100 ethernet, four XML soft keys. The GXP1620 sits between the entry GXP1610 and the BLF-capable GXP1625 — slightly bigger screen, no PoE, no BLF keys.

Display

180×90 backlit LCD

SIP accounts

2 lines

Programmable keys

2 line + 4 soft keys

Ethernet

Dual 10/100 · no PoE

Audio

HD voice · full-duplex

Power

5V DC adapter (included)

$59 one-time

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

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

Order a GXP1620 Rent for $7.99/mo Datasheet (PDF) ↓

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

Grandstream GXP1620 voip desk phone — front view with handset and display — Grandstream GXP1620

Why the GXP1620 is on the catalog.

The GXP1620 is the GXP1610 with a bigger screen — 180×90 backlit LCD instead of 132×48. That extra resolution shows roughly two more lines of caller-ID text and a more readable soft-key row. Everything else (same two SIP accounts, same dual 10/100 ethernet, same lack of PoE, same lack of Bluetooth) is identical.

Where it makes sense: any deployment where the GXP1610 is fine but the small screen has been a complaint. Reception desks at small businesses, after-hours desks where the user has to read off a caller name quickly — the GXP1620's screen is large enough for that to be comfortable.

Where to skip it: the GXP1625 is the same phone with PoE for about $5 more, and at this price tier PoE is almost always worth the small bump (no wall wart, cleaner cable run). For modern deployments, the GRP2603 ($79, gigabit, six BLF keys) is a meaningful step up for $20 more.

Full technical specifications.

Display & user interface
Display	180×90 backlit graphical LCD
Line keys	2 SIP line keys with dual-color LEDs
Soft keys	4 context-sensitive XML soft keys
Navigation	4-way navigation cluster, dedicated function keys
VoIP & SIP
SIP accounts	2 SIP accounts, 2 lines
Protocols	SIP RFC3261, NAT (STUN), TLS, SRTP, BLF
Codecs	G.722, G.711a/u, G.726, G.729A/B, iLBC
Provisioning	TR-069, XML, GDMS
Audio
HD voice	HD handset, HD speakerphone (G.722)
Headset	RJ9 wired headset port
Connectivity
Ethernet	Dual 10/100 Mbps
PoE	Not supported on GXP1620 (see GXP1625 for PoE)
Wi-Fi / Bluetooth	Not supported
Physical
Dimensions	208 × 173 × 75 mm
Weight	Approximately 0.75 kg
In the box (from voip.army)
Included	GXP1620 handset, base, curl cord, ethernet cable, stand, 5V DC adapter, provisioning card
Not included	Nothing — complete box

How it works on voip.army.

Plug the GXP1620 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 connection.

SIP accounts on one phone

2 lines per phone. Each line key has a dual-color LED for status at a glance.

Programmable keys

2 line + 4 soft keys mapped from the voip.army portal — BLF, paging, parking, transfer destinations.

Per-device onboarding fees

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

802.3af

PoE class

Standard PoE — any 802.3af-compliant switch from the last 15 years powers the phone without an adapter.

GDMS

Grandstream Device Management

Provisioning template tested against every Grandstream firmware release for GXP1620. We catch regressions before they reach your fleet.

Need GXP1620s 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

Grandstream GXP1620Bigger screen, two real lines.

Why the GXP1620 is on the catalog.

Full technical specifications.

How it works on voip.army.

Time from plug-in to first call

SIP accounts on one phone

Programmable keys

Per-device onboarding fees

PoE class

Grandstream Device Management

Phones to compare it against.

Grandstream GXP1610

Grandstream GXP1625

Grandstream GXP1628

Need GXP1620s for every desk?