1）SIPsupport2SIPlines.CanconnecttoSIP1andSIP2serveratthesametime2）SIPapplication:supportCallforward/transfer/holding/waiting/3waytalking3）Callcontrolfeatures:Flexibledialmap,Hotline,Emptycallingreject,Blacklistforrejectauthenticatedcall,limitcall,Nodisturb,CallerIDSupportPhonebook500records4）Incomingcalls/Outgoingcalls/Missingcalls.Eachsupport100records5）SupportconferenceandvoicerecordonSIPserver6)Support10kindofringtypeand1userring7)SupportIAX2，8)SupportMWI，SMS，SpeedDial,Memo,Multilanguagerealizeslocalization9)SupportSIP2.0(RFC3261)andcorrelativeRFCs10)Codec:G.711A/ULaw,G.723.1,G.729a/b,G.722,G.722.1,G.72611)Echocancellation:SupportG.168,andHands-freecansupport96ms,HandfreeSpeakerPhone12)SupportVoiceGainSetting,VAD,CNG13)Fullduplexhands-freespeakerphone14)NATtransverse:supportSTUNclient15)DTMF:SupportSIPinfo,DTMFRelay,RFC283316)SupportDMZ,VPN(L2TP)