... voip gatewaysupport 4 RJ45 interface ,1 WAN ,1 voice interface 2,support WIFI function 3,support 1 USB interface VOIP gateway 325+ profile voip gateway ... Server/Client etc. Powerful L2 switch function: VLAN bridging, port rate limiting, flow control, 4 IEEE802.1p QoS priorities ... ToS(Type Of Service) and QoS. Call protocol: SIP(IMS compatible), compliant with RFC2543 and RFC3261, seamless compatible ...