Yeastar O2 Module — 2FXO Expansion Module for PBX

Yeastar O2 Module — 2‑Port FXO Expansion (PSTN Integration) for S‑Series & P‑Series PBX

The Yeastar O2 Module is a dedicated 2-Port FXO expansion module designed to enhance the telephony trunking capabilities of compatible Yeastar PBX systems and VoIP gateways. By adding two FXO interfaces, this module enables seamless connection to traditional PSTN telephone lines, allowing businesses to route inbound and outbound calls between analog public networks and modern IP-PBX platforms.

Perfect for small to medium-sized offices, branch locations, retail environments, and any setup that requires more PSTN trunk capacity, the O2 Module increases connectivity while maintaining reliable call quality. Its compact module design integrates directly with Yeastar systems, providing flexible telephony expansion without the need for standalone FXO gateway units.

With comprehensive support for industry-standard telephony features and efficient trunk routing, the Yeastar O2 Module delivers dependable voice calling and extends the communication capacity of your existing telephony infrastructure.