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Yeastar SO module with 1 FXS and 1 FXO ports is compatible with MyPBX series and S-Series PBX. It has a unique PSTN Fallback function that makes/receives calls even when system powers down. In other words, Yeastar SO is useful for a FAX/print/scan device to integrate with Yeastar IP PBX. Most important, our online shop sells Yeastar SO module at a cheap...
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