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Amazon.com : Flying Voice FTA5111 1 FXS & FXO Port ATA Analog Telephone VoIP Adapter Support for Home and SOHO Phone Service : Office Products
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Poly OBi312 1-FXS 1-FXO ATA Universal VoIP Adapter 2200-49535-001
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What is the Difference Between an FXO Adapter and an FXS Adapter?
