姓名:刘峻霖班级:通信143班学号:2014101108附录一、英文原文:,manySIP[3]/RTP[4]-,someofthesubscriberstothePSTNservicetendtochangetheirhometelephoneservicestoVoIPproducts.,-works,andKThavebeguntodeploySIP/RTP-%ofalltheusersarejoinedin2009inKorea[1].AccordingtoIDC,itisexpectedthatthenumberofVoIPusersinUSwillincreaseto27millionsin2009[2].Hence,espopular,itisnotsurprisingthatalotofVoIPanomalytraffichasbeenalreadyknown[5].So,mercialservicesuchasVoIPservicesshouldprovideessentialsecurityfunctionsregardingprivacy,authentication,integrityandnon--larly,mostofcurrentSIP/RTP--layerprotocolssuchasTransportLayerSecurity(TLS)[6]orSecureRTP(SRTP)[7]havebeenstandardized,,un-ed,,theauthenticationkeyssuchasMD5intheSIPheadercouldbemaliciouslyexploited,becauseSIPisatext-,-based
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