Yeastar O2 Module

Primary Function

• Provides 2 RJ11 FXO ports to terminate two analog PSTN lines and connect them to a Yeastar VoIP PBX system for inbound/outbound PSTN calling.

Compatibility

• Works with Yeastar S-Series and P-Series PBX platforms (e.g., S20, S50, S100, S300, S412, P550, P560, P570).

Key Specifications

• Ports: 2 × RJ11 FXO (PSTN)

• Ring Frequency Detection: 15 – 50 Hz

• Ring Voltage Detection: 30+ VRMS (dependent on FXO mode)

• Termination Type: Analog PSTN (POTS) lines

• Echo Cancellation: Supported

• Signaling Modes:

– Foreign Exchange Office (FXO): 2-way connection to PBX/central office

– Foreign Exchange Station (FXE): Access to carrier services

– Private Line Automatic Ringdown (PLAR): Unswitched point-to-point connection

Typical Use Cases

• PSTN Line Integration: Connects traditional analog service provider lines into an IP-PBX for inbound/outbound calls.

• PSTN Failover: Provides a backup calling path in case VoIP service is unavailable.

• Hybrid Telephony Deployment: Ideal for businesses maintaining both VoIP and legacy analog infrastructure.