Grandstream GRP2636 Carrier-Grade IP Phone

The Grandstream GRP2636 is a twelve-line professional IP phone for the busiest positions in an organisation. Twelve line keys and sixteen SIP accounts sit beneath a 4.3-inch colour display, with twenty-four dedicated MPK extension keys and a paper slot down the side for labelling.

What makes it unusually easy to deploy is how little power it needs for its size — 4.3W over PoE, roughly half what the eight-line GRP2624 and GRP2634 draw. Combined with dual-band Wi-Fi 6, Bluetooth, USB headset support and dual microphones with noise shield, it gives reception desks, coordinators and heavy call handlers a large, legible console without pushing a PoE switch to its limits.

Ideal for

• Reception and switchboard positions in medium and large sites
• Service coordinators and dispatchers with many extensions to monitor
• Executive assistants covering multiple managers
• Busy contact centres needing a large physical key layout
• Sites with tight PoE budgets that still need a large-format phone
• Open-plan offices where speakerphone noise rejection matters

Key features

• Twelve line keys with 16 SIP accounts — genuine console-level line capacity
• Twenty-four MPK extension keys with paper slot — physical BLF and speed-dial positions you can label clearly
• 4.3-inch 480 × 272 colour TFT — large, legible display for a busy desk
• Low 4.3W PoE draw — much lighter on a PoE budget than most twelve-line phones
• Dual microphones with noise shield — suppress open-plan background noise on speakerphone
• Integrated dual-band Wi-Fi 6 — 802.11a/b/g/n/ac/ax on both bands
• Integrated Bluetooth — wireless headsets and mobile contact sync
• USB and RJ9 EHS headset support — suits any common headset type
• 5-way conferencing — set up multi-party calls without the PBX bridge
• Secure boot with encrypted data storage — carrier-grade protection as standard

Technical specification

Telephony

• 12 lines, 12 line keys, up to 16 SIP accounts
• 24 MPK extension keys with paper slot
• 5-way conferencing
• Codecs: G.711µ/a-law, G.722 (wideband), G.723, G.726, G.729A/B, iLBC, Opus

Display

• 4.3-inch 480 × 272 TFT colour LCD

Network and wireless

• Dual switched auto-sensing 10/100/1000 Mbps Gigabit Ethernet ports
• Integrated Power over Ethernet, IEEE 802.3af
• Integrated dual-band 2.4GHz and 5GHz Wi-Fi 6 (802.11a/b/g/n/ac/ax)
• Integrated Bluetooth

Audio and headset

• Full-duplex speakerphone with HD audio
• Dual microphone with noise shield technology
• RJ9 headset jack with EHS for Plantronics headsets
• Integrated USB headset support

Power and physical

• Maximum power consumption: 3.2W via adapter, 4.3W via PoE
• Dimensions: 220 × 210 × 82 mm
• Weight: 880g unit, 1260g packaged

Security

• Secure boot, dual firmware images, encrypted data storage

Datasheet

Download the official Grandstream GRP2636 datasheet (PDF)

Works with

• Grandstream GRP2650 — 14 lines and a 5-inch 1280 × 720 display
• Grandstream GRP2634 — the eight-line alternative for lighter positions
• Grandstream GUV3005 headset — busy-light USB headset for reception use
• Grandstream GWN7802P PoE switch
• All Grandstream IP phones
• IP PBX solutions

Frequently asked questions

How many extensions can I monitor on the GRP2636?

Twenty-four dedicated MPK keys with a paper slot for labelling, alongside twelve line keys, so a single phone covers a substantial team.

Why is the power draw so much lower than the GRP2624?

Different hardware design. The GRP2636 draws a maximum of 4.3W over PoE compared with 10.8W for the GRP2624, which matters when you are populating every port on a switch.

Does it have a second labelling screen?

No. The GRP2636 uses a paper slot for its MPK labels. If you want digital labelling, look at the GRP2616 or GRP2650.

Can it connect over Wi-Fi?

Yes, dual-band Wi-Fi 6 is integrated, so only power is required if no data point is available.

Is noise shield useful in a call centre?

It is one of the more noticeable features in open-plan rooms. The dual microphones suppress background conversation so the far end hears the speaker rather than the office.

Specifying phones for a busy reception or contact centre? Call 0333 242 1314 or email sales@clisecure.com.