IP PHONE, support online status, VPN, sip/iax2

Detailed Product Description

2.1 Support Protocol：
 SIP (RFC3261, RFC3265)
 Support IAX2 protocol
 Voice codec: 711a/u, 729a/b
 G.168 echo cancellation standard, compliant 96ms with speaker mode
 Support the adjustment of volumn：including the input/output of handset and the speaker.
 Jitter Buffer, VAD, CNG,SIP/IAX2, Domain name register, point-to-point Call
 Support the switch automatically of SRV main backup server
 RTP and RTCP；
 Support the Inbound/Outbound transmission；SIP info，DTMF Relay，RFC2833
 Many countries'' standard ring
 NAT transversal: 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 either proxy
 Support redundancy public server，can auto switch to backup server when host server has problem.
 Support SIP application, including SIP Call forward/transfer/holding/waiting.
 Support the presence state of server and the presence mechanism of Peer-to-peer
2.2 Network Features:
 Support two models: Bridge and Router, integrate two ports router function.
 Support basic NAT and NAPT.
 Support PPPoE for xDSL，and support off hook auto dial.
 Support DHCP Client for WAN.
 Support DHCP server for LAN.
 Support DNS relay for LAN，can provide DNS service for LAN Network equipment
 Support the domain parse DNS SRV in WAN port；
 Support SNTP Client，can capture the time automatically the network；
 Use advanced DSP tech to insure high quality voice；
 Use advanced jitter buffer tech to prevent the delaying and losing for package information；
 Support Network Tools, including ping，race route，telnet client
 Support three modes to configure WAN port IP, they are：static, DHCP, and PPPoE.
 Provide firewall control for small LAN；
 Provide optional priority level for small LAN；
 Support Secondly Layer QoS（802.1p）；
2.3 Advanced Function
 IP PBX special function, support 10 groups booking extension numbers, can display directly the online state of the booking numbers by the indicator.if the indicator is green, means it is online; the indicator is green and twinkle,means it is in the course of the call; if red, means it is offline.
 Support the voice message、play the message by one key、IVR personality record the message, voice hints.
 Call in display、ban calling out 、setting no-disturb、answer automatically、dial number automatically while picking up the telephone、quick dial ；
 Dial waiting、call transfer、three ways call、multi-dial forward；
 Setting the black namelist and confine numbers；
 Support point-point calling directly；
 Setting the ended number methods；
 Setting the ended number add、 and substitution；
 Setting the fixed calling ways；
 Use the number directory to record the contacted name、number and address；
 Support restrain volume、call detection；
 Support background yawp；
 Support to restrain echo and auto gain；
 Support DIGEST validate and MD5/MD5-sess encapsulation；