| Call protocol: SIP (IMS compatible), according to RFC2543 and RFC3261, seamless compatible with all popular call agent, including HUAWEI, ZTE, Alcatel-Lucent, etc. | |
| Rich network protocol: including TCP/IP, UDP, RTP/RTCP, ARP, FTP/TFTP, HTTP, Telnet, ICMP, NTP/SNTP, etc. | |
| Rich L2 switch function: including VLAN, port rate limiting, 4 IEEE802.1p QoS queues. | |
| Integrated heartbeat function and support active/standby call agent. | |
| Support Voice Activity Detection (VAD) and Comfort noise Generation (CNG). | |
| Voice coding: ITU-T G.711/G.723.1(5.3K/6.3Kbit/s)/G.729, auto-negotiate with call agent. | |
| Echo cancellation exceeding ITU-T G.165/G.168-2002, up to 128ms tail length. | |
| Integrated packet loss compensation (PLC). | |
| Support high/low speed fax, bypass fax, and T38 fax. | |
| Support high speed MODEM(56Kbps) dial access. | |
| 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. | |
| Support auto-adaptive jitter buffer. | |
| Support ToS(Type Of Service), QoS(Quality of Service). | |
| Multi-party conferencing. | |
| Line testing according to GR-909. | |
| IP address assignment: dynamic PPPoE/DHCP Client and static IP. | |
| Support WEB and CLI, integrated IVR template file. Customer can configure the device through the digit key on the phone. | |
| Support remote firmware upgrade. | |
| Call loss less than 0.01%. |