1.10/100Base-T RJ-45 for LAN,10/100Base-T RJ-45 for PC 2.Support SIP 2.0 (RFC3261) and correlative RFCs FeaturesSupport SIP 2.0 (RFC3261) and correlative RFCs Codec:G.711 A/U Law, G.723.1, G.729a/b, G.722,G.722.1, G.726n Echon cancellation: Support G.168, and Hands-free can support 96ms, Hand free Speaker Phone Support Voice Gain Setting, VAD, CNG DTMF:Support SIP info, DTMF Relay, RFC2833 Full ...