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Research on Basic Security Strategy of VoIP
zhang tie-jun~a; wang zhi-qiang~a; xu li-na~b; zhu zi-hao~c(a.college of communication engineering; jilin university; changchun 130012; china; b.zhuhai college; jilin university; zhuhai 519041; china; c.college of computer science and technolongy; jilin university; changchun 130012; china)
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