... ) Support IAX2 Support Voice codec:G711A/u,G729,andG723.1 Key Phone : CPH-806 Features:Minitor featureSupport one SIP (RFC3261,RFC2546 ... mode.Support jitter Buffer ,VAD,CNG,SIP Domain name register,point-to-point CallSupport the the Inbound/Outbound transmission;SIP info ,DTMF ...