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Grandstream HT814 (HandyTone 4 port FXS analog VoIP adapter, integrated Gigabit NAT router)
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What is the Difference Between an FXO Adapter and an FXS Adapter?
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What is the Difference Between an FXO Adapter and an FXS Adapter?
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Cisco SPA112 Dual FXS Port ATA Adapter
Grandstream HT813 Hybrid Analog Telephone Adapter with FXS and FXO Ports
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