OBi200 - Google Voice VoIP Adapter | Poly, formerly Plantronics & Polycom
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4213640L5 Adtran Total Access 604 Router VoIP Phone Adapter Voice Card En Fast En (Refurbished)
Linksys SPA2102 Analog VoIP Adapter with 2 FXS Ports (Free to do pre-
Amazon.com: 2-Port VoIP SIP Phone Adapter - GT202 Wireless Router, Supports WiFi Asterisk ATA VOS FXS Fax. Suitable for Home or Business (Black) : Office Products
Cisco SPA122 ATA with Router VoIP phone adapter 2 phone (FXS)