Click Fraud Grandstream GBX20 EXT Extension Module
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Grandstream GBX20 EXT Extension Module

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03/02/2020 £124.00 exc. VAT
148.80 inc. VAT
Availability:In stock for next day delivery
Key Features
  • 4.3 inch TFT color LCD
  • 20 SIP lines per page
  • 40 SIP lines per module

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Please Note: This module is compatible with the Grandstream GXV3350 and GRP2615 IP Phones. 

Grandstream GBX20 EXT Extension Module

The Grandstream GBX20 EXT is an extension module that adds functionality, versatility and flexibility to Grandstream’s GRP2615 Carrier-Grade IP Phone and GXV3350 IP Video Phone.

Grandstream GBX20 EXT Key Features:

  • 4.3 inch TFT color LCD screen
  • 20 lines per page (each module contains 2 pages, for up to 40 lines per module)
  • Combine up-to 4 daisy-chained modules for 160 contacts/extensions
  • BLF, call park /pick-up, speed-dial, presence, intercom, voice conferencing transfer/forward

The GBX20 features a 272x480 LCD display that offers up to 40 contacts per module with support for up to 160 contacts by using 4 modules. The extension module 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. The GBX20 is an ideal sol ution for businesses and receptionists managing high call volumes, the GBX20 ensures maximum productiv ity by efficiently monitoring and dispatching incoming calls.

Please Note: This product only includes the Grandstream GBX20 EXT Expansion Module. 
Grandstream GBX20 EXT Technical Specification


  • 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 Phones

  • GRP2615
  • GXV3350

Graphic Display

  • 4.3 inch (272x480) TFT color LCD

Feature Support

  • Local GUI with animation driven from the host GRP2615 or GXV3350 phone; Multiple line/call appearances


  • A single GBX20 can be powered by host phone (GRP2615 or GXV3350); when 2 or more GBX20 is connected an included 12V/1A PSU is needed.

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

Package content

  • GBX20 Extension Board, base stand, Extension Board Connector Plate, Screws, USB cable, Quick Installation Guide

Temperature and Humidity

  • Operation: 0°C to 40°C
  • Storage: -10°C to 60°C
  • Humidity: 10% to 90% non-condensing


  • 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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