... VoIP Protocols (IETF SIP V2)Two 10/100 Ethernet for WAN / LAN connectionsSupply dynamic DNS serviceSpeech quality ensured ... performance ARM 9 Processor Basic Features Support one PTT portLEDs for Power, Ready, Status, WAN, PC, FXSCall Forward, ... bufferAutomatic traversal of NAT and firewallVLAN / QosRouterEcho cancellation for SpeakerphoneComfort noise generation (CNG)Voice activity detection (VAD) ...