... XMLFull duplex hands-free speakerphoneSIP support SIP domain, SIP authentication (none, basic, MD5), DNS name of server,Peer to Peer/ IP callDTMF ... ProtocolSTUN - Simple Traversal of User Datagram ...MD5 Message-Digest AlgorithmDNS: Domain Name ServerRTP: Real-time Transport ProtocolRTCP:Real-time Control ProtocolTelnet:Internet ...