... gateway. It is highly integrated router, NAT, phone gateway functionality and has market-leading voice quality, rich functionality, and lightweight, compact design ... ,PPPOE, STUNDTMF MethodRFC 2833,SIP InfoSignalingSIP(RFC 3261)over UDPProvisioningTFTP,HTTPManagementWEB browser, Telnet, Voice promptPhysicalUniversal Power SupplyOutput:12VDC, input:100-240VAC/50HzEnvironmentalOperational ...