Support 2.0 (RFC3261) and correlative RFCs Support 1 SIP line Codec:G.711A/u, G.723.1 high/low,G.729 a/b, G.722.1,G.726 Support HD voice Soft keys programmable Hard function key reprogrammable SIP application:support call forward/transfer(blind/attended)/holding/ waiting/3 way talking/conference/pickup/join call/redial and unredial/ click to dial/secondary dialing automatically Support SRTP - Support Bridge mode in LAN
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