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10-channel USB-FXO Adapter | Amfeltec Corporation
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AC Adapter for Grandstream UCM6204 UCM6202 IP PBX - 2 Port 4 FXO & 2 FXS Ports | eBay
VIP-157 1 FXS / 1 FXO SIP Analog Telephone Adapter - Click IT Direct
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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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