... ,G.723.1,GSM,iLBC Echo cancellation: G.168 with 64ms echo tailDynamic jitter buffer, voice activity detector (VAD ... dialing, busy tone detection, 3-way conferenceNetwork IPIPv4 and IPv6 dual stack, DHCP Client & Server, DHCP options, Static IP ... , SNMPv2, Telnet, TFTP, SyslogAuxiliary MaintenanceInquiry and set by phone dialer, factory reset buttonProtocol and standardProtocol SIP (RFC3261 and etc.), ...