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Yeastar YST-O2 2-Port FXO Analog PSTN Module
The Yeastar O2 (YST-O2) is a 2-port FXO telephony module designed to add analog PSTN/POTS line connectivity to compatible Yeastar S-Series and P-Series VoIP PBX systems.
Product SpecificationsThe O2 module is compatible with:
S20, S50, S412 and P550:
The O2 module can be installed directly into the available module slots.
S100, S300, P560 and P570:
These systems require the appropriate Expansion Board to add telephony modules. The EX08 provides module slots for installing O2 modules.

Documentation