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If the SPA lost power, will Line1 automatically use the PSTN line attached to the FXO?

April 26, 2017attached automatically fxo line line1 Lost power PSTN spa

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If the SPA lost power, will Line1 automatically use the PSTN line attached to the FXO?

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Yes, and when power comes back on, the SPA will let the Line 1 user continue with any in-progress calls to the PSTN. After the Line 1 user hangs up, the SPA will restore the Line 1 phone to use the VoIP service.