Yeastar SO Module 1 FXS & 1 FXO Port for S20 & P550

Empower your business communications with enhanced reliability and hybrid connectivity using the Yeastar SO Module. Designed specifically for Yeastar IP-PBX systems, including the S-Series and P-Series appliances, this module integrates one FXS port and one FXO port onto a single card, offering a vital PSTN failover feature that guarantees lifeline phone connectivity even during system power interruptions.

Critical PSTN Failover Protection

In standard operations, the Yeastar SO module bridges conventional analog lines (FXO) and analog endpoints (FXS) into your IP phone system. In the event of a sudden power outage or system reboot, the internal physical relay connects the FXO port directly to the FXS port. This allows team members to continue making and receiving critical emergency calls through the connected analog handset via the physical PSTN line.

Key Features & Benefits

• 1 FXS & 1 FXO Port: Connects one analog extension (phone, DECT cordless handset, or fax machine) and one external analog PSTN line simultaneously.
• Unique Power-Off Failover: Ensures zero downtime for vital voice calls by automatically linking FXS to FXO if the PBX loses power.
• Seamless Integration: Modular design slots directly into compatible Yeastar motherboard slots or expansion boards without cumbersome external adapters.
• Versatile Hybrid Telephony: Bridges traditional copper telephone lines and legacy analog devices directly into your advanced VoIP environment.

Broad PBX Compatibility

The Yeastar SO module is engineered for plug-and-play installation across Yeastar business PBX systems, including Yeastar S20, S50, S100, and S300 (requires expansion board on larger models), as well as the Yeastar P-Series IP PBXs like the P550, P560, and P570.