Features

1) Call protocol: SIP (IMS compatible), according to RFC2543 and RFC3261, seamless compatible with all popular call agents, including HUAWEI, ZTE, Alcatel-Lucent, etc.

2) Rich network protocol: including TCP/IP, UDP, RTP/RTCP, ARP, FTP/TFTP, HTTP, Telnet, ICMP, NTP/SNTP, etc.

3) Integrated heartbeat function and support active/standby call agent.

4) Support Voice Activity Detection (VAD) and Comfort noise Generation (CNG).

5) Voice coding: ITU-T G.711/G.723.1(5.3K/6.3Kbit/s)/G.729, auto-negotiate with call agent.

6) Echo cancellation exceeding ITU-T G.165/G.168-2002, up to 128ms tail length.

7) Integrated packet loss compensation (PLC).

8) Support high/low speed fax, bypass fax, and T38 fax.

9) Support high speed MODEM(56Kbps) dial access.

10) Support RFC2833 and redundant RFC2833, difference rings, reverse polarity, CID, MD5 authentication, abbreviation dial, call forward, call waiting, hot-line call, alarm clock, and all kinds of value-added voice service.

11) Support auto-adaptive jitter buffer.

12) Support ToS(Type Of Service), QoS(Quality of Service).

13) Multi-party conferencing.

14) Line testing according to GR-909.

15) IP address assignment: dynamic PPPoE/DHCP Client and static IP.

16) Support WEB and CLI.

17) Support remote firmware upgrade.

18) Call loss less than 0.01%.