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Extension Modules

Grandstream GBX20

Extension Module for GRP26xx IP Phones

The Grandstream GBX20 is an extension module for the GRP26xx professional IP phones. Each module provides 20 physical buttons with left/right paging for 40 programmable keys and dual-colour LEDs, and up to four modules can be daisy-chained for 160 additional keys.

40 Keys / Module

Programmable BLF & speed-dial

Up to 160 Keys

Daisy-chain 4 modules

Dual-Colour LED

At-a-glance presence

On-Module Labels

Easy key identification

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40
Keys/Module
160
Max Keys
LED
Dual-Colour
GDMS
Managed
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All Grandstream Products in a quick overview.

IP Phones, IP Video Phones, Access Points, IPPBX, Gateways& ATAs

Technical Features

Expand Every Workstation

The GBX20 adds programmable BLF and speed-dial keys so receptionists and busy teams can manage more calls, faster.

40 Keys per Module

20 physical buttons with left/right paging for 40 programmable keys per module

Dual-Colour LED

Bright dual-colour LED indicators show line, BLF and presence status at a glance

BLF & Speed Dial

Programmable busy-lamp-field and speed-dial keys for fast call handling

Daisy-Chain Expansion

Connect up to 4 modules for up to 160 additional programmable keys

On-Screen Labels

Clear on-module labelling so every key is easy to identify

GDMS Ready

Provisioned and managed alongside the host phone through Grandstream GDMS

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Frequently Asked Questions

Grandstream GBX20 — Common Questions

Everything you need to know about the Grandstream GBX20 before you buy.

The Grandstream GBX20 is an extension module for the GRP26xx professional IP phones. Each module provides 20 physical buttons with left/right paging for 40 programmable keys and dual-colour LEDs, and up to four modules can be daisy-chained for 160 additional keys. It is ideal for receptionists and operators on GRP26xx phones who need many BLF and speed-dial keys.
The GBX20 is designed for the Grandstream GRP2614, GRP2615, GRP2616, GRP2624, GRP2634, GRP2636, GRP2650 and GRP2670 professional IP phones.
Each GBX20 module provides 40 programmable keys, and up to 4 modules can be daisy-chained for up to 160 additional keys.
Each key can be programmed as a busy-lamp-field (BLF), speed-dial or presence indicator with a dual-colour LED for at-a-glance status.
Yes — the GBX20 is provisioned and managed alongside its host phone through Grandstream's GDMS cloud platform.
Yes — the Grandstream GBX20 is available in India through Cohesive Technologies, an authorised national distributor of Grandstream IP telephony. Request pricing at sales@cohesiveglobal.com or visit cohesiveglobal.com.