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Polycom OBI312 2200-49535-001 Voice Adapter with USB, 1 FXS Port, 1 FXO Port
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UCM6208 8-Port FXO 2-Port FXS Device (UCM6208)
Amfeltec Piranha USB-FXO Adapter | eBay
Grandstream HT813 2-Port FXS/FXO with NAT Router ATA - Shop4Tele
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