Extension Module GBX20

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SKU: GBX20 Categories: ,


Extension Module


The GBX20 is an Extension Module that adds functionality, versatility and flexibility to Grandstream’s GRP2615 & GRP2624 Carrier-Grade IP Phones and GXV3350 IP Video Phone. It features a 272×480 LCD display that offers up to 40 contacts per module with support for up to 160 contacts by using 4 modules. The GBX20 supports a wide-range of advanced call features including BLF, call park/pick-up, speed-dial, presence, intercom, voice conferencing transfer/forward and much more. An ideal solution for businesses and receptionists managing high call volumes, the GBX20 ensures maximum productivity by efficiently monitoring and dispatching incoming  calls.


20 per page (each module contains 2 pages, for up to 40 lines per module Up to 160 with 4 daisy-chained modules

Compatible Grandstream

IP Phones

GRP2615, GRP2624 & GXV3350

Graphic Display

4.3 inch (272×480) TFT color LCD

Feature Support

Local GUI: Multiple line/call appearances


A single GBX20 can be powered by host phone (GRP2615 or GXV3350); when 2 or more GBX20 are connected the included 12V/1A PSU will power the GBX20s.

Firmware Upgrades

GBX20 firmware is upgraded by direct network download through host phone (GRP2615 or GXV3350)’s network connection and firmware upgrade setup.


Dimension: 210mm*124mm*33.5mm; Unit weight: 360g; Package weight:700g

Temperature and Humidity

Operation: 0°C to 40°C

Storage: -10°C to 60°C

Humidity:  10% to 90% Non-condensing

Package Content

GBX20 Extension Board, base stand, Extension Board Connector Plate, Screws, USB cable, Quick Installation Guide, 12V/1A Power Adapter.


FCC: Part 15 Class B IC: ICES-003

CE: EN 55032; EN 55035; EN 61000-3-2; EN 61000-3-3; EN 62368-1 RCM: AS/NZS CISPR32; AS/NZS 62368.1


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