The difference between FXO and FXS
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VoIP Gateway: What's the Difference between FXS and FXO?
What are FXS and FXO?
Tech Note
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What are FXS and FXO ports and what is the difference? | Yeastar
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Knowledgebase - What do the terms FXS and FXO mean? | Amernet
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What are FXS and FXO?
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