1. Support 1 line for VoIP call,SIP(RFC2543,ARFC3261);PhoneBook with 100 groups memory;
2.Network Protocol: TFTP Client/DHCP Client/ PPPoE Client;Telnet/HTTP Server; DNS Client;
IP,TCP,UDP,RTP,RTCP;IP,ICMP,ARP,RARP,SNTP;
3. Voice Quality:VAD: Voice activity detection;NG:Comfortable noise generato; LEC: Line echo canceller; Packet Loss Compensation;Adaptive Jitter Buffer;
4. Codec：G.711: 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;
5.Call Function：Call Hold；Call Waiting；Call Forward；Caller ID;3-way conference;
6. DTMF Function：In-Band DTMF;Out-of Band DTMF;SIP Info;
7. SIP Server：Registrar Server (three SIP account);Outbound Proxy;
8.Phone Function：Volume Adjustment；Speed dial, Phone book;Flash；Speaker Phone;
9.IP Assignment：Static IP and DHCP;PPPoE support for ADSL or Cable modem;
10. Security：HTTP 1.1 basic/digest authentication for Web setup; MD5 for SIP authentication (RFC2069/ RFC 2617;
voip Sip phone （NXD-804）Support POE Key Features:
1. IEEE 802.3af compliant input interface;
2. Complete input / output isolation;
3. Efficiency: 78% minimal;Over load & short circuit protection;
voip Sip phone （NXD-804）Electric Spec:
1. Support POE (Power over Ethernet)
RoHS / CE /FCC compliant；