... SIP (RFC3261,RFC2543) Support IAX2 Support Voice codec:G711A/u,G729,andG723.1 Key Phone : CPH-806 Features:Minitor featureSupport one ... proxySupport two models: Bridge and Router ,integrate two ports router function.Support PPPoE for xDSL ,and support off hook auto dial ... waiting ,call transfer ,three ways call ,and multi-call forwardCaller ID displat ,ban calling out ,setting no-disturb ,dial number ...