... (none, basic, MD5), DNS name of server,Peer to Peer/ IP call.SIP support 2 SIP lines or only one IAX2 lines ... . Can connect to SIP1 and SIP2 server at the same time ... DNS serverSupport DNS Relay, SNTP Client, FirewallNetwork tools in telnet server: Including ping, trace route,telnet clientProtocolsMAC AddressTCP:Transmission Control Protocol ...