Support Protocol

◆ SIP (RFC3261, RFC2543)
◆ Support IAX2 protocol
◆ Support codec: G.711A/u, G.722,G.723 high/low, G.729 A/B
◆ Support G.168 echo cancellation standard, compliant 96ms echo cancellation with speaker mode
◆ Support voice volume adjustment, including IN/OUT of handset and speaker
◆ Support Jitter Buffer, VAD, CNG, SIP, Domain name register, point-to-point Call
◆ Support RTP and RTCP
◆ Support the Inbound/Outbound transmission; SIP info, DTMF Relay, RFC2833
◆ Support many countries' standard ring
◆ Support NAT: Support STUN, CITRON, AVS Mode
◆ Support SIP domain, SIP Authentication (none, basic, MD5), Domain Name parse
◆ Support two SIP server synchronously, including Pubic Server/ Private server, can make a call by any proxy. You can back-up and select any above SIP server.
◆Support SIP application, including SIP Call forward/transfer/holding/conference/pickup/redial/unredial/joincall

Network Features:

◆ Support PPPoE for xDSL, and support auto redial when disconnect
◆ Support DHCP Client for WAN
◆ Support DHCP server for LAN
◆ Support DNS relay for LAN and provide DNS service for LAN Network equipment
◆ Support DNS domain name resolution in WAN port
◆ Support router and switch function in LAN port
◆ Support SNTP Client to get time from internet
◆ Support advanced DSP tech to ensure high quality voice
◆ Support advanced jitter buffer tech to prevent the info package delaying and losing
◆ Support network tool: ping, trace route, telnet client
◆ Support three modes to configure WAN port IP, they are: static, DHCP, and PPPoE
◆ Support NAPT
◆ Provide firewall for small LAN
◆ Provide optional priority level for small LAN
◆ Support second layer QoS (802.1p)
◆ Support VLAN
◆Support VPN (L2TP)

Special and Advanced Function:

◆ Caller ID display, ban calling out, avoid-disturb setting, auto-answering, auto dial while picking up the telephone, quick dial;
◆ Call waiting, call transfer, three ways call, and multi-dial forward
◆ Setting the black list and limit numbers
◆ Support point to point call
◆ Setting the ended number methods
◆ Setting the ended number add, delete and substitution
◆ Setting the fixed calling ways
◆ Support phone number with name and number
◆ Support Silence Suppression, VAD (Voice Activity Detection)
◆ Support CNG (Comfort Noise Generation)
◆ Support Echo Suppression and AGC (Automatic Gain Control)
◆ Support DIGEST validate and MD5/MD5-sess encapsulation
◆ Support remote auto configuration and edition auto-upgrade.

Management and maintainence

◆Support safe mode and update via safe mode
◆ Support configuration via web, keypad, http, telnet; support the user IP address filtering limits
◆Support update software and configuration files through HTTP, FTP, TFTP
◆Support syslog
◆Support set up a number of authorities and user name, password; support reverse Telnet through NAT / firewall machine for remote management