... IAX2 Support Voice codec:G711A/u,G729,andG723.1 Key Phone : CPH-806 Features:Minitor featureSupport one SIP (RFC3261,RFC2546 ... G723.1Support G.168 echo cancellation standard,compliant 96ms with speaker mode.Support jitter Buffer ,VAD,CNG,SIP Domain name ... Power over Ethernet (POE) functionSupport user defined ring toneSupport phone book ,and can set different rings according to different incoming ...