Stand-alone 16 Ports Analog to IP Converter FXS VoIP Gateway Fully Compliant with SIP and IAX2 SIP Phone Gateway, US $ 1 - 486 / Unit, Fujian, China (Mainland), Yeastar, Neogate TA1600.Source from Xiamen Yeastar Information Technology Co., Ltd. on Waimaotong.com.