Grandstream GXP2135 Enterprise HD IP Phone

The Grandstream GXP2135 takes the GXP2130's colour display and Bluetooth and roughly triples the key capacity. Eight dual-colour line keys carry four SIP accounts, and those keys can be programmed digitally as thirty-two customisable BLF or fast-dial positions — enough for a team leader or small switchboard to work from without an expansion module.

It is the sweet spot of the GXP21xx family for most busy users: substantial presence monitoring, 4-way conferencing, Gigabit ports with integrated PoE and a maximum draw of only 6.4W. Bluetooth handles mobile contact syncing and wireless headsets, and the whole thing provisions in bulk over TR-069 or AES-encrypted XML like the rest of the range.

Key features

• Eight dual-colour line keys with 4 SIP accounts — substantial line capacity on a standard-size phone
• 32 digitally programmable BLF or fast-dial keys — cover a whole department without an expansion module
• 2.8-inch 320 × 240 colour TFT — clear caller detail and key labelling
• Integrated Bluetooth — sync mobile contacts or pair a wireless headset
• Dual Gigabit Ethernet with integrated PoE — one cable, full PC speed
• 4-way audio conferencing — small meetings run from the handset
• Low 6.4W maximum draw — easy on a PoE switch budget
• Wideband HD audio — G.722 and Opus for clearer conversations
• RJ9 headset jack with EHS — Plantronics electronic hook switch support
• 256-bit AES, SRTP, TLS and 802.1x — secure configuration and media

Technical specification

Telephony

• 4 SIP accounts across 8 lines and 8 line keys
• 32 digitally programmable and customisable BLF or fast-dial keys
• 4-way audio conferencing
• Codecs: G.711µ/a-law, G.722 (wideband), G.723.1, G.726, G.729A/B, iLBC, Opus
• In-band and out-of-band DTMF

Display and keys

• 2.8-inch 320 × 240 TFT colour LCD
• 8 dual-colour line keys

Network and wireless

• Dual switched auto-sensing 10/100/1000 Mbps Gigabit Ethernet ports with integrated PoE
• Built-in Bluetooth for mobile syncing and compatible headsets

Audio and headset

• HD handset and speakerphone with wideband audio
• RJ9 headset jack with EHS for Plantronics headsets

Power and physical

• Universal adapter: 100–240V input, +12V 0.5A output, or PoE
• Maximum power consumption: 6.4W
• Dimensions: 201mm wide × 193mm long × 85mm high
• Unit weight: 0.85kg

Security and provisioning

• 256-bit AES encrypted configuration file, SRTP, TLS, 802.1x
• Firmware upgrade via TFTP, HTTP or HTTPS
• Mass provisioning via TR-069 or AES-encrypted XML configuration file

Datasheet

Download the official Grandstream GXP2135 datasheet (PDF)

Works with

• Grandstream GXP2130 v2 — the smaller three-account model in the same family
• PSU for GXP2135 — replacement mains adapter
• Grandstream GRP2624 — the current-generation eight-line successor
• Grandstream GWN7801P PoE switch
• All Grandstream IP phones
• IP PBX solutions

Frequently asked questions

How can eight keys become thirty-two BLF positions?

The line keys are digitally programmable and paged on the colour display, so each physical key can represent several assigned extensions across pages.

Does the GXP2135 support an expansion module?

No. For cascaded GXP2200EXT modules, choose the GXP2140 or GXP2170.

Is Bluetooth useful on a desk phone?

It allows mobile contacts to be synced to the handset and lets a Bluetooth headset be used, which many users prefer to a corded model.

How much power does it need?

A maximum of 6.4W, so it sits comfortably within a standard 802.3af PoE budget.

What is the modern equivalent?

The GRP2624 is the closest current-generation model, with eight line keys, twelve SIP accounts, Wi-Fi 6, Bluetooth and USB headset support.

Planning a GXP21xx to GRP migration? Call 0333 242 1314 or email sales@clisecure.com.