Caller ID Display Grandstream Networks GBX20

The GBX20 is a backlit LCD extension module compatible with Grandstream GXV3350 and GRP2615 IP phones. It provides 20 dual-colored programmable extension keys plus 2 arrow keys for paging, allowing each GBX20 to manage up to 40 contacts or extensions. Up to four GBX20 modules can be connected to a supported phone for a combined total of 160 contacts or extensions.

Advantages

The GBX20 offers clear backlit display and dual-colored keys for easy status recognition, compactly expanding a phone’s line and contact capacity. Page-switching arrow keys enable quick navigation between sets of contacts, and the module's compatibility with GXV3350 and GRP2615 ensures straightforward integration into existing Grandstream setups.

Key specifications

• Compatibility: Grandstream GXV3350, GRP2615
• Physical keys: 20 dual-colored programmable extension keys
• Navigation: 2 arrow keys for page switching
• Per-module capacity: up to 40 contacts/extensions (with paging)
• Max modules per phone: 4 (up to 160 contacts/extensions total)

How to use

Attach the GBX20 to a compatible Grandstream phone following the phone’s accessory connection instructions. Program the extension keys via the phone’s configuration interface or web GUI to assign contacts, speed dials, or line appearances. Use the arrow keys to switch pages and access the second set of 20 programmable keys, enabling up to 40 entries per module.

Recommendations

For larger deployments, connect up to four GBX20 modules to a single GXV3350 or GRP2615 to expand to 160 contacts. Ensure firmware on the phone is up to date for full compatibility and consult Grandstream documentation for setup details.