Amazon.com: Grandstream Powerful 2-Port ATA with Gigabit NAT
Amazon.com: Grandstream Powerful 2-Port ATA with Gigabit NAT,Grandstream HT812 Analog Telephone Adapter ATA VoIP | eBay,Amazon.co.jp: Grandstream HT812 VoIPアダプタ ATA 2-FXS,Grandstream HT812 Powerful 2-port ATA with Gigabit NAT,Grandstream introduce new 2-Port ATA HT812, with Gigabit NAT