YEASTAR SO Module W FXS and FXO Ports by YEASTAR at Intelligent Business Management. MPN: SOModule. Hurry! Limited time offer. Offer valid only while supplies last. The SO is a module with a FXS and FXO Port. Make/receive calls even when system powers down.The SO is a module with a FXS and FXO Port. Make/receive calls even when system powers down..
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