Support SIP protocol
Support Bridge and
Router(NAT&NAPT) models.
TCP/UDP/IP, ICMP, HTTP, DHCP
Client (WAN Interface), DHCP
Server(LAN Interface), DNS Client,
DNS Relay, SNTP, PPPoE, FTP, TFTP.
Voice Codecs: G.711(A-law/U-law),
G.723.1, G.729A/B
NAT penetration: STUN client, AVS and Citron etc. Can modify SIP
register port, HTTP server port,
Telnet server port and RTP port.
Support standard voice features such as numeric Caller ID Display,
Call Waiting, Hold, Transfer, Do-Not-disturb, Forward, in-band and out-of-band
DTMF, Hotline (off hook autodial), ban outgoing.
Support standard encryption and
authentication (DIGEST using MD5, MD5- sess