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    • Max Ports: 2 - Ports (Max)
    • Telephony Interface: FXS - Optional (YR-S2)
    Picture of Yeastar S2 2FXS port module

    Yeastar S2 2FXS port module

    Yeastar S2, PBX Module 2 FXS Ports - S2
    • Port: 2 RJ11 FXS Ports
    • Supported Model: S412, S20, S50, S100, S300, P550, P560, P570
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    Picture of Yeastar SO 1FXS + 1FXO Port Module

    Yeastar SO 1FXS + 1FXO Port Module

    Yeastar SO, PBX Module 1 FXS and 1 FXO - SO
    • Port: 1 FXO RJ11 Port + 1 FXS RJ11 FXO Port
    • Supported Model: S20, S50, S100, S300, P550, P560, P570
    • FXO Ring Frequency Detection: 15~50 Hz
    • FXS Ring Frequency: 25 Hz
    • Termination: PSTN lines and Analog Telephone / Fax Machine
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