Description
The GSM module is a module with 1 GSM channel that couldcall out by GSM
Unique PSTN Fall back Function, Make/receive call, when system powers down.
Yeastar SO Module โ Specifications
Ports & Compatibility
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Ports: 1 ร FXS (RJโ11), 1 ร FXO (RJโ11)
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Compatible with Yeastar SโSeries PBX (S20, S50, S100, S300) and PโSeries PBX (P550, P560, P570)
Telephony / Line Support & Functionality
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Supports connection of one analog phone/fax (via FXS)
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Supports one PSTN line (via FXO) for trunk or external line connection
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Provides PSTN fallback: in case of PBX system failure or power outage, phone connected to FXS can still ring / use the PSTN line connected via FXO โ ensuring call continuity
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Supports analog devices (phone, fax, analog lines)
Signalling / Line Characteristics
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FXO port ring-frequency detection: 15โ50 Hz
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FXS port ring-frequency: 25 Hz
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Ring voltage: 85 V
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Termination impedance option: 600 ฮฉ
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Built-in echo cancellation
Use Cases & Advantages
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Allows hybrid PBX setup: mix of VoIP and analog/PSTN lines/devices
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Good for small offices needing an analog phone plus PSTN trunk via a single module
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Handy as failover/backโup branch: analog line remains usable if main PBX fails
