VoiceCrystal F-P is a commercial IP conference phone developed by Fenghua communications Company. It is a luxe IP telephone compatible with H.323 V4 and SIP V2, achieving full duplex with deep Echo cancellation and having 128*64 graphics LCD with back light, which can display many languages. When it is disposed into H.323, VoiceCrystal F-P can cooperate with GK and GW of most H.323. It also has perfect H.450 protocol to complete all telecom value-added services such as call transfer, call forward, call waiting, etc.. Cooperating with soft exchange system, it can totally replace traditional PBX or KEY LINE PHONE. It can also be used as LAN phone or hot-line phone. When it is disposed into SIP, VoiceCrystal F-P can cooperate with most SIP system. Besides having popular G.723 and G.729, it can use low-priced GSM voice compression algorithms