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| voip - What does a device with 2FXS & 2 FXO mean - Super User By TTT This site seems to explain what FXS/FXO means, specifically the FXS & FXO & VOIP section. In relation to your question, a two port FXS would mean you could connect to two FXS gateways, while being able to connect two FXO ports. Recent Questions - Super User |
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