Key Phone Support SIP (RFC3261,RFC2543) Support IAX2 Support Voice codec:G711A/u,G729,andG723.1 Key Phone : CPH-806 Features:Minitor featureSupport one SIP (RFC3261,RFC2546)Support IAX2 Support Voice code: G711A/u, G729 ,and G723.1Support G.168 echo cancellation standard,compliant 96ms with speaker mode.Support jitter Buffer ,VAD,CNG,SIP Domain name register,point-to-point CallSupport the the ...