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Grandstream · GXP series · legacy enterprise

Grandstream GXP2135Four lines, color screen, Bluetooth.

A 2.8-inch color LCD, four SIP accounts, eight dual-color line keys with multi-page support (32 effective keys), dual gigabit, PoE class 2, built-in Bluetooth, and 4× GXP2200EXT sidecar support. The GXP2135 is the middle of the GXP2100 family — four lines and a real Bluetooth radio for under $170.

Display
2.8″ color LCD · 320×240
SIP accounts
4 lines
Programmable keys
8 keys × 4 pages = 32
Ethernet
Dual gigabit · PoE class 2
Bluetooth
Built in
Expansion
Up to 4× GXP2200EXT
$169 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 GXP2135 Rent for $11.99/mo Datasheet (PDF) ↓
✓ Auto-provisioned out of the box ✓ Warranty replacement included with rental ✓ Free shipping on orders $200+
Grandstream GXP2135 voip desk phone — front view with handset and display
Grandstream GXP2135

Why the GXP2135 is on the catalog.

The GXP2135 is the GXP2130 with one more SIP account and a slightly more polished build. 4 lines vs. 3, same screen, same key count, same Bluetooth, same sidecar support. The build difference is subtle but real — the handset cradle, the soft-key bezels, the keypad action all feel a step better.

Where it sits: a solid admin / executive desk phone in the legacy GXP catalog. 4 SIP lines covers a CEO line + DID + main + after-hours; 32 programmable keys covers BLF for 28 coworkers; sidecar support means you can grow into a receptionist console if the role changes. Bluetooth means a wireless headset works without adapter dongles.

Modern equivalent: the GRP2614 (~$30 less, more screen, more lines, Wi-Fi built in, USB) is a substantial upgrade for less money. For any new deployment we strongly recommend the GRP2614 over the GXP2135. The GXP2135 is the right pick only for extending existing GXP2135 fleets or where the specific GXP-style key layout is required.

Full technical specifications.

Display & user interface
Display2.8-inch 320×240 color LCD
Programmable keys8 dual-color line keys × 4 pages = 32 effective
Soft keys4 XML soft keys
VoIP & SIP
SIP accounts4 SIP accounts, 4 lines
ProtocolsSIP RFC3261, NAT (STUN), TLS, SRTP, BLF, SCA
CodecsOpus, G.722, G.711a/u, G.726, G.729A/B, iLBC
ProvisioningTR-069, XML, GDMS
Audio
HD voiceHD handset, HD speaker
HeadsetRJ9 wired, Bluetooth, EHS via adapter
Connectivity
EthernetDual 10/100/1000 Mbps gigabit
PoEIEEE 802.3af Class 2
BluetoothBuilt-in Bluetooth 4.0
Wi-FiNot built-in (see GXP2140 with USB Wi-Fi)
Expansion
SidecarUp to 4× GXP2200EXT
Max effective keys192
Physical
Dimensions230 × 200 × 80 mm
WeightApproximately 1.0 kg
In the box (from voip.army)
IncludedGXP2135 handset, base, curl cord, ethernet cable, stand, provisioning card
Not includedPower adapter (PoE preferred), sidecars if needed

How it works on voip.army.

Plug the GXP2135 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.

4

SIP accounts on one phone

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

8

Programmable keys

8 keys × 4 pages = 32 mapped from the voip.army portal — BLF, paging, parking, transfer destinations.

0

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 GXP2135. We catch regressions before they reach your fleet.

Phones to compare it against.

Same family, slightly different fit.

Step down

Grandstream GXP2130

3 SIP lines, same screen + keys. About $40 less.

Compare →
Step up

Grandstream GXP2140

4.3-inch color screen, USB Wi-Fi support. About $20 more.

Compare →
Modern equivalent

Grandstream GRP2614

16 lines, 4.3″ screen, Wi-Fi + BT built in. About $30 less.

Compare →

See all 119 supported phones →

Need GXP2135s 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