Yeastar GSM Module for S-Series PBX

The Yeastar GSM Module is a plug-and-play expansion component that adds a single GSM cellular channel to Yeastar S-Series and P-Series PBX systems. It enables businesses to make and receive calls via mobile networks, providing a cost-effective alternative to landlines and acting as a reliable backup during VoIP or PSTN outages. With support for SMS messaging, Least Cost Routing, and global mobile network compatibility, this module ensures uninterrupted communication and reduces telephony costs.

Product Features

Single GSM Channel

Each module supports one simultaneous voice call via a standard GSM SIM card, allowing flexible mobile trunking.

Global Compatibility

Equipped with a quad-band SIMCom engine (850/900/1800/1900 MHz), it works with major mobile networks worldwide.

SMS Capabilities

The module allows sending and receiving text messages, including SMS-to-Email notifications, bulk messaging, and API integration for automation.

Cost Optimization

Supports Least Cost Routing (LCR) to automatically route calls through the GSM network when it is the most economical option.

Plug-and-Play

Powered directly by the PBX chassis (under 3W), it requires no external power adapters or complex wiring, simplifying installation.

Redundancy & Reliability

Acts as a backup during VoIP or landline failures, ensuring continuous communication for critical business operations.

Ease of Installation

The module can be installed directly into small chassis (S20/S50) or into an expansion board for larger systems (S100/S300) and is configured via the Yeastar web interface.

Product Specifications

• GSM Channels: 1 simultaneous voice call channel
• GSM Engine: SIMCom quad-band chipset
• Frequency Bands: 850 / 900 / 1800 / 1900 MHz
• Transmitter Power: +33 dBm (2W) at 850/900 MHz; +30 dBm (1W) at 1800/1900 MHz
• Voice Codecs: G.711 (a/u-law), G.722, G.726, G.729A, GSM-FR
• SMS Protocols: SMS-to-Email, SMS-to-HTTP, bulk SMS via API
• DTMF Signaling: RFC2833, SIP INFO, In-band
• SIM Interface: 1 slot; compatible with 1.8V and 3V SIM cards
• Antenna: SMA-J connector; 50 Ω impedance, 2.5–3 dBi gain
• Power Draw: Under 3W (approx. 1–2W average), powered via PBX backplane
• Physical Dimensions: 90mm x 60mm; approx. 150g
• Environment: Operating 0°C to 45°C; Humidity 10%–90% non-condensing
• Hardware Integration: PCIe-style interface; small chassis (S20/S50) plug-in; large chassis (S100/S300, P560/P570) via EX08 expansion board
• Backward Compatibility: Works with 2G, 3G, and 4G SIM cards for voice services
• Least Cost Routing (LCR): Automatically routes calls to the cheapest path via GSM
• SMS Gateway: Send/receive SMS via PBX web interface or Linkus mobile apps
• Redundancy: Acts as PSTN/VoIP failover
• Echo Cancellation: Built-in G.168 hardware echo cancellation with 128ms tail length