... , SIP authentication (none, basic, MD5), DNS name of server,Peer to Peer/ IP callDTMF:Support SIP info, ... , caller ID, CLIR (reject theanonymous call), CLIP (make a call with anonymous), Dial without registerIncoming calls /outgoing calls / ... ProtocolPPPoE:PPP Protocol over EthernetPoE(option)SNTP, Simple Network Time ProtocolSTUN - Simple Traversal of User Datagram ...MD5 Message-Digest AlgorithmDNS: ...