Yeastar SO module with 1 FXS & 1 FXO port
- Brand: Yeastar
- MPN: YS-SO Module
- Part #: NETYST1126
- UPC:
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Yeastar SO module with 1 FXS & 1 FXO port
- Brand: Yeastar
- MPN: YS-SO Module
- Part #: NETYST1126
Product URL: https://www.pbtech.co.nz/product/NETYST1126/Yeastar-SO-module-with-1-FXS--1-FXO-port
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Features
The Yeastar SO Module is an internal telephony expansion card designed to add one analog telephone port (FXS) and one analog PSTN line port (FXO) to compatible Yeastar IP PBX systems. Unlike pure VoIP extensions, this module lets the PBX connect directly to traditional analog devices such as legacy phones, fax machines, or a standard telephone line. It's often used to maintain analog support while running a modern VoIP system.
This module features:
- 1 × FXS RJ11 port - for connecting an analog telephone or fax machine, letting extensions use traditional devices through your VoIP PBX.
- 1 × FXO RJ11 port - for connecting a PSTN (POTS) telephone line from your telecom provider, enabling trunk connectivity.
These RJ11 port interfaces make it simple to integrate legacy circuits or devices directly into the IP PBX infrastructure.
PSTN Fallback Function
One of the SO Module's standout features is its PSTN fallback capability. In the event of a PBX power failure or system crash, the module can automatically bridge the analog phone (FXS) to the PSTN line (FXO) so that basic incoming/outgoing voice communication continues uninterrupted. This ensures continuity of critical phone service even when the IP PBX itself isn't operational.
Compatibility & Flexibility
The SO Module is compatible with a wide range of Yeastar VoIP PBX platforms, including:
- Yeastar S-Series models: S20, S50, S100, and S300 (using the appropriate expansion board on larger systems)
- Yeastar P-Series models: P550, P560, and P570, by fitting into their modular expansion slots
It can also be used in legacy MyPBX lines. This flexibility means businesses can mix VoIP with existing analog endpoints without needing separate gateways.
Specifications
Brand
Yeastar
Module Type
Analog telephony expansion module
FXS Ports
1 × FXS (RJ11)
FXO Ports
1 × FXO (RJ11)
Function
Analog extension + PSTN trunk support
PSTN Fallback
Supported
Compatible PBX Series
Yeastar S-Series & P-Series
Supported Models
S20, S50, S100, S300, P550, P560, P570
Supported Devices
Analog phone, fax machine, PSTN line
Use Case
Hybrid VoIP and analog environments
Industry Application
VoIP PBX telephony expansion

