Yeaster 02 Module

Yeastar O2 Module (YST-O2) is a hot-pluggable expansion card featuring two FXO ports designed to connect analog PSTN/POTS lines to Yeastar S-Series (S20, S50, S100, S300, S412) and P-Series PBX systems. It enables hybrid communication, providing a reliable analog backup (failover) and supports Caller ID and echo cancellation.