Network protocol:
    SIP v1 (RFC2543), v2(RFC3261)
    IP/TCP/UDP/RTP/RTCP
    IP/ICMP/ARP/RARP/SNTP
    TFTP Client/DHCP Client/ PPPoE Client
    Telnet/HTTP Server
    DNS Client

  NAT/DHCP Server
    Codec: G.711, G.723.1, G.726, G.729
    IP assignment: Static IP, DHCP, PPPoE
 

 Interfaces:
    Ethernet port - 2 X 10/100MHz Ethernet Ports, one for WAN and one for LAN
    FXS port - 1 FXS Port for Tel
    1 PSTN Port (can modify to FXO port)