Description
Grandstream GBX Series GBX20 Color LCD Extension Module (Model: GBX20) is a Color IP Phone Extension Module engineered for busy receptionists, corporate switchboards, call center supervisors, and executive assistants. Featuring a 4.3-inch 272×480 TFT color display, 20 physical dual-color LED keys, and 2 page switch keys, it delivers 40 programmable extensions per unit and supports daisy-chaining up to 4 modules for 160 total contacts.
Compatible with Grandstream GXV3350, GRP2615, GRP2624, GRP2634, GRP2636, GRP2650, and GRP2670 phones, it provides dynamic BLF, speed dial, and call control. The module draws operating power directly from host phones (with external PSU support when cascading multiple units), maintaining a fanless acoustic profile.
Technical Specifications
| Component / Parameter | Technical Specification |
|---|---|
| Product Line | GBX Series |
| Model / SKU | GBX20 |
| Capacity / Scale | 20 Physical Keys per Module; 40 Extensions across 2 Screen Pages; Daisy-chain up to 4 Modules (160 Lines) |
| Network / Telephony Interfaces | 1x USB Type-A (Host Phone Connection), 1x USB Type-B (Daisy-Chain Interconnection) |
| Packet / Voice Processing | Hardware-driven BLF, Speed Dial, Call Park, Pick-up, Presence, Intercom, Transfer |
| Expansion & Peripheral Ports | USB Cascading Interface for linking up to 4 GBX20 units |
| Operating System / Management | Managed via Host Phone UI and Grandstream GDMS Cloud Platform |
| Power Supply Specifications | Powered directly by Host Phone (12VDC 1A external power adapter required for 2 or more cascaded units) |
| Maximum Power Consumption | 3.5W |
Mechanical & Environmental Specifications
| Parameter / Feature | Specification / Rating |
|---|---|
| Physical Dimensions (L × W × H) | 210 × 124 × 33.5 mm |
| Unit Weight | 360 g (0.36 kg) |
| Chassis & Display | 4.3 inch (272 × 480) TFT color LCD; 20 dual-color illuminated keys, 2 page keys |
| Heat Dissipation / Cooling | Fanless natural heat dissipation (noise-free operation) |
| Operating Temperature Range | 0°C to 40°C (32°F to 104°F) |
| Operating Relative Humidity | 10% to 90% (Non-condensing) |
| Mounting Capabilities | Desktop phone-docking bracket and Wall-mount |
Key Features & Capabilities
- 4.3-Inch Color Screen: High-resolution 272×480 TFT color display delivers vivid extension status and contact details.
- High-Density Line Tracking: 20 physical buttons with dual-color LEDs provide rapid access to 40 extensions across 2 screen pages.
- Daisy-Chain Expandability: Cascade up to 4 GBX20 modules to monitor up to 160 lines from a single phone console.
- Fanless Quiet Operation: Passive thermal design guarantees silent desktop performance in executive office spaces.
- Universal USB Connectivity: Connects seamlessly to host GRP and GXV series phones via standard high-speed USB interface.
- Centralized Cloud Provisioning: Programmable keys and line assignments synchronize automatically via host phone and GDMS.
Recommended Applications
The Grandstream GBX Series GBX20 Color LCD Extension Module is designed for enterprise and commercial deployment scenarios, including:
- Corporate reception desks routing high-volume incoming phone inquiries
- Executive administrative desks requiring rapid multi-department speed dialing
- Call center supervisory desks monitoring live agent presence and extension status
- Legal and medical practices managing directory routing and line transfers
- Commercial switchboard consoles coordinating facility-wide communications
Installation & Operating Environment
The Grandstream GBX Series GBX20 Color LCD Extension Module features a Desktop phone-docking bracket and Wall-mount enclosure measuring 210 × 124 × 33.5 mm and weighing 360 g (0.36 kg). It operates across an environmental temperature range of 0°C to 40°C (32°F to 104°F) and relative humidity of 10% to 90% (Non-condensing). Powered via Powered directly by Host Phone (12VDC 1A external power adapter required for 2 or more cascaded units), it ensures dependable continuous operation and structured integration into commercial networking racks and office work environments.
