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What is the Difference Between an FXO Adapter and an FXS Adapter?
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Grandstream HT813 Analog Telephone Adapter 1 FXS & 1 FXO port
Cisco SPA8800 IP Telephony Gateway with 4 FXS and 4 FXO Ports - Cisco
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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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MAPS™ FXO FXS Emulator (Automated Analog Terminal (FXO) and Network Port (FXS) Testing)
Welltech Wellgate 2540 - 4 port FXO (PSTN/POTS) Analog VoIP Gateway (
Poly OBi312 1-FXS 1-FXO ATA Universal VoIP Adapter 2200-49535-001
VIP-157 1 FXS / 1 FXO SIP Analog Telephone Adapter - Click IT Direct
VoIP Analog Phone Adapter | 1-to-4 FXS VoIP Phone Adapter. Made in USA
Grandstream HT813 2-Port FXS/FXO with NAT Router ATA - Shop4Tele
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