The FXS module allows the Digium TDM400P card to terminate analog telephones

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The FXO module allows the Digium TDM400P card to terminate analog telephone lines (POTS)

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Digium AEX410P PCI Express Base Card with 0 FXS, 0 FXO, 0 Echo Cancellation.

Digium Analog Echo Cancellation Module for:

• TDM410P
• TDM800P
• AEX800P
• TDM2400
• AEX2400P