Performance and features
Support three sip servers running at the same time
Large 2*16  character LCD with blue back light
Support NAT pass,Build-in-Router
Support DHCP Server
Support Call Forward
IVR voice prompt
Settings by HTTP web browser (IE6.0)
Advanced settings by Telnet
Support Caller ID display
140 entries phone book number
Support M1-M9 speed dial number
adjustable user password and super password
Support In band,RFC2833,SIP Info DTMF transmit
Support FXO port(YWH600BO
HTTP,FTP,TFTP Auto-provision
Support Call waiting,Call hold,Call Transfer, 3-way conference calls
Support Auto answer

Voice Features
G.711 a/u;64K bit/s(PCM)
G.723.1;6.3k/5.3k bit/s
G.726:16k/24K/32K/40K bit/s(ADPCM)
G.729A:8k bit/s(CS-ACELP)
G.729B:adds VAD&CNG to G.729
GSM
G.165/G.167 compliant 16ms echo cancellation
VAD (Voice Activity Detection)
CNG(Comfort Noise Generation)
AEC(Auto Echo Cancellation)

VOIP Features
SIPv1(RFC2543),v2(RF3261)
802.3/802.3U 10 Base T/100 Base TX
IEEE 802.1 P/Q Tag Vlan
TCP(RFC793) IP(RFC791) UDP(RFC768)
ICMP(rFC792) ARP(RFC826) SNTP(RFC2030)
Telent(RFC318) HTTP(RFC2616)
DHCP(RFC2131) FTP(RFC959)TFTP(RFC1350)
PPPoE(RFC2516) DNS(RFC1034,RFC1035)
RTP&RTCP(RFC1889)