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  1. In the WebUI, click the Settings tab.
  2. In the left navigation pane, go to Node Interfaces > Relay Config.

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    1Relay Configuration

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  3. Select the appropriate option in the Relay Config State field.

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Specifies the Powerdown Telephony Passthrough mode for FAX/FXO ports.

Online Operation
In the online mode, the analog (FXS/FXO) ports are controlled and routed by the SBC.

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If the SBC is powered down, the FXS and FXO ports are physically and electrically connected in the same manner as they are in the passthrough mode.

Passthrough Operation
In the passthrough mode, the FXO and FXS ports are physically connected via relays. In this mode, there is a 1:1 correspondence between FXS and FXO ports. FXS port 1:1 is physically/electrically connected directly to FXO port 2:1, FXS port 1:2 connects to FXO port 2:2, etc.

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1Relay Configuration State

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