# Grandstream GBX20 Extension Module for GRP2615 and GXV3350 IP Phones

- Canonical URL: https://www.netxl.com/voip-phones/grandstream-gbx20-extension-module-for-grp2615-and-gxv3350-ip-phones/
- Brand: Grandstream
- SKU / part number: GBX20
- EAN (GTIN-13): 6947273702931
- Category: VoIP (https://www.netxl.com/voip-phones/)

## Pricing (GBP, guest pricing — trade customers see account pricing via the API)
| Quantity | ex VAT | inc VAT |
| --- | --- | --- |
| 1+ | £128.33 | £153.99 |
| 5+ | £117.63 | £141.16 |
| 10+ | £106.94 | £128.33 |

## Availability and shipping
- Availability: 42 in stock
- Shipping: Royal Mail Tracked - Next Working Day — £7.19, 1 working day(s)

## Description

The Granstream GBX20 is an Extension Module that adds functionality, versatility and flexibility to Grandstream’s GRP2615 Carrier-Grade IP Phone and GXV3350 IP Video Phone.  It 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 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.

## Key highlights

- Lines: 20 per page (each module contains 2 pages, for up to 40 lines per module. Up to 160 with 4 daisy-chained modules
- Graphic Display: 4.3 inch (272x480) TFT color LCD
- Feature Support: Local GUI - Multiple line/call appearances

## Documents

- [GBX20 Data Sheet](https://www.netxl.com/grandstream/docs/gbx20-data-sheet.pdf)

## Programmatic access

- This page in HTML: append a trailing slash instead of `.md`
- NetXL Customer API (real-time customer pricing, stock, ordering): https://api.netxl.com — OpenAPI at https://api.netxl.com/openapi.yaml
- MCP server for AI agents: https://mcp.netxl.com
- Machine-readable site index: https://www.netxl.com/llms.txt
- API documentation: https://www.netxl.com/api-docs.md