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What are FXS and FXO •• Analog ports | 3CX
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什麽是回波消除?
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Tech Note
64 ports fxs/fxo Analog Voice Gateway / IPPBX
What are FXS and FXO •• Analog ports | 3CX
The difference between FXO and FXS
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File:Tecom AP3303 FXO port.jpg - Wikimedia Commons
