Grandstream HT801 FXS 1-Port Analog Telephone Adapter ATA VoIP | eBay
Flyingvoice Fta1101 Portable Wireless Voip Adapter Two 10/100 Ethernet For Wan / Lan Connections Built-in Ap Mode Ata - Voip Products - AliExpress
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