Yeastar O2 – 2 FXO Ports Expansion module to connect two analog PSTN lines to Yeastar IP PBX systems Easy installation and high sound quality Ideal for a smooth transition to VoIP

Yeastar O2 – 2 FXO Ports is a professional expansion model designed specifically for Yeastar IP PBX systems, an ideal solution for businesses wanting to move to a VoIP environment without losing connectivity to the public network.

The Yeastar O2 – 2 FXO Ports allow calls to be made and received from analog lines via the Yeastar system, with full support for all advanced central station features such as IVR, call transfer, call recording, queues, and ringing groups.

It also helps minimize communication costs by using local lines for long-distance communications when needed.

Central PBX expansion modules feature easy Plug & Play installation within compatible Yeastar devices, and are automatically recognized via the Web GUI management interface, making it easy to set up and manage without technical complexity.

It also offers stable performance and high sound quality, making it suitable for use in work environments that rely on constant communication.

Yeastar O2-2 FXO Ports are an ideal choice for offices, businesses, clinics, small hotels, and organizations that need to integrate analog lines with modern communication systems efficiently and flexibly.

Yeastar O2 is a compact expansion model that has two RJ11 FXO ports to connect public analog telephone lines (PSTN/POTS) to Yeastar’s VoIP PBX systems, enabling hybrid switching without replacing legacy infrastructure.

Yeastar O2 expansion module integration – 2 FXO Ports

Compatible with S-Series (S20, S50, S100, S100, S300, S412) and P-Series (P550, P560, P570), YST-EX08 is required for some models such as S100/S300, with technical features including 15-50 Hz ringing frequency detection, 30+ VRMS ringing voltage detection by FXO mode, PSTN line termination, G.168 echo cancellation, and multiple signaling modes: Foreign Exchange Office (two-way PBX connection), Foreign Exchange Station Defined Network (carrier access), and Private Line Automatic Ringdown (PLAR) for direct connections.

Featuring easy installation inside a PBX, support for Asterisk-compatible SIP/IAX2 protocols, QoS, VLAN, TLS/SRTP security, DTMF (RFC2833/In-band), Caller ID (DTMF/FSK), and call drop methods (Busy Tone, Polarity Reversal), making it ideal for SMBs that need analog extensions with advanced VoIP features like intelligent registration and routing without additional costs.