Yeastar O2 Module 2FXO (YST-O2)

The Yeastar YST-O2 is a dual-port FXO expansion module designed to extend Yeastar IP-PBX systems with analog PSTN connectivity. It allows businesses to integrate traditional telephone lines into modern VoIP networks, ensuring seamless communication and system flexibility. With plug-and-play installation, built-in echo cancellation, and high-definition voice codec support, the YST-O2 provides reliable analog trunking for both small and enterprise-level deployments.

Product Features

Connectivity

The module terminates two analog PSTN lines using standard RJ11 ports, enabling businesses to bridge VoIP and traditional telephone networks.

System Integration

It allows flexible inbound and outbound call routing through the host PBX software, supporting both SIP trunks and analog lines.

Audio Quality

Built-in echo cancellation and support for the G.711 codec ensure toll-quality voice communication for all calls.

Ease of Use

The YST-O2 is designed for plug-and-play installation into available expansion slots and is hot-swappable, minimizing downtime during maintenance.

No External Power

The module draws power directly from the host PBX system or gateway, eliminating the need for additional power adapters.

Compatibility

It works with multiple Yeastar product lines, including:

• S-Series VoIP PBX: S20, S50, S100, S300, S412
• P-Series PBX: P520, P550, P560, P570
• MyPBX Series: SOHO, Standard, Pro, Enterprise

Product Specifications

• Ports: 2 x RJ11 FXO ports for terminating PSTN/POTS lines
• Signaling Modes: FXO (two-way CO connection), FXS-defined network access, PLAR (Private Line Automatic Ringdown)
• Codec Support: G.711 (a/µ law), G.722, G.729A, G.726, GSM
• Echo Cancellation: Advanced software-based cancellation to prevent voice feedback
• Caller ID: Supports DTMF and FSK standards
• Ring Frequency Detection: 15–50 Hz
• Ring Voltage: 30+ VRMS (up to 90V RMS depending on mode)
• Hot-Swappable: Can be added or replaced without shutting down the PBX
• Impedance Matching: Adjustable per line via FXO Impedance Match Tool
• Failover: Configurable PSTN backup if VoIP/SIP trunks fail
• Volume Control: TX/RX volume adjustable from -30 dB to 12 dB via PBX interface
• Operating Temperature: 0°C to 40°C
• Storage Temperature: -20°C to 70°C
• Humidity: 10% to 90% non-condensing
• Expansion Capacity:
  • P560: 1 expansion board
  • S100 & P570: up to 2 expansion boards
  • S300: up to 3 expansion boards