Quick Installation Guide

ManualsBrandsGrandstream Networks ManualsElectronicsExtension Module

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INSTALLING GBX20 EXTENSION MODULE: TIPS FOR USING THE GBX20:

Remove the rubber cov-

ers on the back of the

GBX20. You will see the

slots for the connector

plate.

EXT Port to link the

GRP2615/GXV3350

EXT Port to link

another GBX20

EXT Port to link the

GBX20

CONFIGURING GBX20 EXTENSION MODULE:

After the GBX20 is successfully booted up and connected to the GRP2615/

GXV3350, the GBX20 can be congured via the host GRP2615/GXV3350’s web

GUI.

1. Login the GXV3350/GRP2615 web GUI and congure multiple purpose

keys for extension board 1/2/3/4 under web GUI → Applications → Pro-

grammable Keys → GBX20 Settings page.

2. On the GRP2615/GXV3350 extension board (i.e., GBX20), press LEFT

or RIGHT button to browse all the MPK → Programmable Keys’ status

in di󰀨erent pages.

3. For more conguration information, please refer to the GRP2615 or

GXV3350’s user manual.

Multi-Purpose Keys

Left Key

Right Key

1. Power up the GRP2615/GXV3350, the GBX20 extension board will show

the booting up screen with version information and connecting status.

2. After successfully booting up, the extension board will stay in idle. Press

and hold the Left key for 3 seconds to check the version information and

status.

3. Press any key to return to normal display.

4. Press Left or Right key to switch between two pages if there are multi-

purpose keys congured in both pages.

5. Press the multi-purpose key to perform the assigned function.

1. On the back of GBX20 and the phone, there are slots for the connector

plate. Attach the connector plate between the slots for GBX20 and the

extension board.

2. Apply the screw provided and securely tighten it in.

3. Connect the extension board to the phone via the EXT port using the

USB cable provided.

4. Install both stands on the phone and the GBX20 board.

Refer to online documents and FAQ for more detailed information:

http://www.grandstream.com/our-products

Note: In case two or more GBX20 extension modules are connected to

the GRP2615/GXV3350, the second GBX20 needs to be powered on by a

12V/1A PSU.