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Features: 1) Network protocol:
a) SIP V1 (RFC2543), V2 (RFC3261), IP / TCP / UDP / RTP / RTCP
b) IP / ICMP / ARP / RARP / SNTP, TFTP client / DHCP client / PPPoE client
c) Telnet / HTTP server, DNS client, NAT / DHCP server
2) Codec
a) G.711: 64Kbps (PCM), G.723.1: 6.3 / 5.3Kbps
b) G.726: 16 / 24 / 32 / 40Kbps (ADPCM), G.729A: 8Kbps (CS-ACELP)
c) G.729B: adds VAD and CNG to G.729
3) Voice quality:
a) VAD: voice activity detection, CNG: comfortable noise generator
b) LEC: line echo canceler, packet loss compensation adaptive jitter buffer
4) Call function: call hold, call waiting, call forward, caller ID, 3-way conference
5) DTMF function
6) Tone: ring tone ring back tone, dial tone, busy tone, programming tone
7) Phone function: volume adjustment, speed dial key, phone book and flash
8) IP assignment: static IP, DHCP, PPPoE
9) Security:
a) HTTP 1.1 basic / digest authentication for Web setup
b) MD5 for SIP authentication (R
