Asterisk No FXO ports detected

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Right now I am running DSM 4.3-3827 Update 5 and I would like to consolidate my office IP-PBX system into the same NAS that is running this DSM.


However, when I go to Asterisk > Trunks, it says "No FXO ports detected !!". I understand that I need to add an analog telephony cards such as this one... ... log/4-port




or ... ys/gxw410x


Before I purchase any of these, may I know has anyone successfully tried them or any products that allow the use PSTN lines in the Asterisk?

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