... IAX2 Support Voice codec:G711A/u,G729,andG723.1 Key Phone : CPH-806 Features:Minitor featureSupport one SIP (RFC3261,RFC2546) ... .Support DNS relay on LAN port and can provide DNS service for LAN Network equipmeng .Support SNTP Client ,can auto-obtain ... .Support Power over Ethernet (POE) functionSupport user defined ring toneSupport phone book ,and can set different rings according to different incoming ...