1.3 SIP PROXY and accounts registered at the same time for each FXS port (total 6 user names, one SIP PROXY offline, other one can replace it timely).
2. Built-in Router.
3. With reverse-polarity signal, billing function supported.
4. Support SIP 2.0 (RFC3261), TCP/UDP/IP, RTP/RTCP, HTTP, ICMP, ARP/RARP, DNS, DHCP (both client and server), NTP, PPPo E, STUN, TFTP.
5. Powerful digital signal processing (DSP) to ensure superb audio quality.6. Advanced adaptive jitter control and packet loss concealment technology.7. Support various vocoders including G.711 (a-law and u-law), G.723.1 (5.3K/6.3K), G.726, G.729A/B and i LBC.
8. Support Caller ID/Name display or block, Hold, Call Waiting, Flash, Call Transfer (blind/consultative).
9. Call forward, in-band DTMF, Dial Plans.
10. Support call waiting caller ID.
11. Support fax pass through and T.38 (pending).
12. Support silence suppression, VAD (Voice Activity Detection), CNG (Comfort Nois Generation).
13. Line echo cancellation (G.168), and AGC (Automatic Gain Control).14. Support standard encryption and authrntication (DIGEST using Md 5 and MD5-sess).
15. Support for Layer 2 (802.1q VLAN,82.1P) and Layer 3 Qo S (Tos, Diffserv, MPLS).
16. Support automated NAT traversal without manual manipulaton of firewall/NAT.
17. Support device configuration via built-in IVR, web browser or downloading encrypted configuration file through TFTP or HTTP.
18. Support firmware upgrade via TFTP or HTTP.
19. Ultra compact (wallet size) and lightweight design, great companion for travelers.
20. Desk/Wall mounts.
1. WAN:1pcs, connect to XDSL/Cable Modem or Network Switch or Router
2. LAN:1pcs, connect to PC or other network equipment
3. FXS:2pcs, connect to Normal phone, DECT/Cordless phone, Electrograph, Switch etc.
4. Power:1pcs, connect to Power adapter:
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