Goodcom IP1000H are upgraded from the original item of VoIP-33,it is innovative IP Phone IP Phone that offer a rich set of functionality and superb voice quality . Support two modes ; Support standard Network Protocols ; VoIP Protocols ; Voices Codecs ;Dual SIP servers support; NAT transversal ;Support two SIP servers synchronously ; Support standard voice features ; Support standard encryption and authentication ; Support silence Suppression ; Provide easy configuration thru manual operation ( Web interface or Telnet ) or automated centralized configuration file via TFTP or HTTP .