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  1. 23gorele76

    Analog interfaces FXS-FXO nd E&M

    Who can detaily explain where we should use FXS, FXO and E&M? What are the differencies between them? For example: If two of WAN sides routers have got only FXS ports that directly connected to PBXs, can we not call other sides PBX outside? So we need at least one FXO port?

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