1)TCP/IPV4(IPV6autoadapt)2)ITU-TH.323V4Standard3)H.2250V4Standard4)H.245V7Standard6)H.235Standard（MD5，HMAC-SHA1）7)ITU-TG.711Alaw/ULaw,G.729A,G.729AB,andG.723.1VoiceCodec8)RFC1889RealTimeDataTransmission9)ProprietaryFirewall-Pass-ThroughTechnology10)SIPV2.0Standard11)SimpleTraversalofUDPoverNAT(STUN)12)Web-baseManagement13)PPPoverEthernet(PPPoE)14)PPPAuthenticationProtocol(PAP)15)InternetControlMessageProtocol(ICMP)16)TFTPClient17)HyperTextTransferProtocol(HTTP)18)DynamicHostConfigurationProtocol(DHCP)19)DomainNameSystem(DNS)20)UseraccountauthenticationusingMD521)Out-bandDTMFRelay:RFC2833andSIPInfo