Yeastar GSM Module: Cellular Connectivity for S-Series PBX

The Yeastar GSM Module provides wireless cellular network connectivity for Yeastar S-Series IP-PBX systems. This expansion module enables businesses to make and receive calls through GSM/3G mobile networks instead of traditional phone lines. Organizations seeking cost-effective mobile integration or backup communication channels will find this module essential for maintaining reliable voice connectivity.

Technical Specifications

Cellular Network Support

• Network Standards: GSM 850/900/1800/1900 MHz, WCDMA 2100 MHz
• GSM Channels: 1 voice channel per module
• SIM Card Slots: 2 standard SIM card slots (2FF format)
• Network Selection: Automatic or manual carrier selection

Voice & Messaging

• Voice Codecs: GSM-FR, GSM-EFR, AMR
• SMS Support: Send/receive text messages up to 160 characters
• DTMF: In-band and out-of-band transmission
• Echo Cancellation: ITU-T G.168 compliant

Connectivity & Interface

• Antenna Connection: External GSM antenna with SMA connector
• LED Indicators: Signal strength, network status, call activity
• Installation Type: Internal expansion slot

Power & Environmental

• Power Consumption: 3W typical, 8W maximum during transmission
• Operating Temperature: 0°C to 40°C (32°F to 104°F)
• Storage Temperature: -20°C to 70°C (-4°F to 158°F)
• Humidity: 10% to 90% non-condensing

Physical Dimensions

• Form Factor: Modular expansion card
• Dimensions: 115mm × 75mm × 20mm
• Weight: 95g (excluding antenna)

System Compatibility

• Compatible Systems: Yeastar S20, S50, S100, S300 VoIP PBX models
• Maximum Modules: Up to 2 modules per system (model dependent)
• Required Accessory: External GSM antenna (sold separately)

Use Cases & Applications

Mobile Network Integration

Businesses can leverage existing mobile plan benefits by routing calls through cellular networks. The Yeastar GSM Module converts mobile connectivity into extensions accessible to all office phones. Companies with unlimited mobile plans effectively eliminate per-minute calling costs while maintaining professional PBX features like call transfer and voicemail.

Rural & Remote Locations

Organizations operating in areas without reliable landline infrastructure benefit from cellular-based telephony. The GSM Module provides stable communication channels where traditional PSTN service proves unavailable or unreliable. For instance, construction sites, agricultural operations, and temporary offices establish full PBX functionality using only mobile network coverage.

Emergency Backup Communication

The module serves as critical failover connectivity when primary internet or PSTN lines fail. Incoming calls automatically route through available GSM channels during outages, ensuring business continuity. Healthcare facilities, emergency services, and customer support centers rely on this redundancy to maintain constant accessibility during infrastructure disruptions.

Cost Optimization Strategy

Companies receiving numerous mobile calls can terminate these directly through GSM trunks, avoiding expensive mobile-to-landline transfer fees. The dual SIM capability enables intelligent routing between carriers based on time-of-day rates or destination networks. Moreover, businesses can maintain local presence in multiple regions by using SIM cards from different geographic areas.

SMS Integration

Organizations automate customer communication through integrated SMS functionality. The Yeastar GSM Module enables appointment reminders, delivery notifications, and two-way customer service messaging directly from the PBX. Retail businesses send promotional messages while service providers dispatch automated status updates without requiring separate SMS gateway services.