简介:VoIP(VoiceoverIP)isarapidlygrowingareawithgreatmarketpotential.Topromoteitforbothcommericalandresearchpurposes,aprototypeVoIPsystembasedonstate-of-the-artotorolacommunicationtechniqueshasbeendeveloped.ItisagatewaysystemintegratingaPBXandaVoIPmodule.AllcomponentsthatH.323definestosupprotVoIPareimplementedintheVoIPmodule,thoughinasimplifiedmanner,Asanembeddedsystem,thesystemfeaturesrealtimenessandtaskdistributiveness.Anumberofaddiitonaltechniquesareusedtoimprovetheperformance,includingnoisesuppression,zerocopy,andbufferstructureoptimization.Whenrefinedininteroperability,thesystemwillalsoreadilyserveasaproduct.
简介:Inthisletter,anovelalgorithmisproposedforidentificationofonepopulartypeofVoIP(VoiceoverIP)application,MSNVoIP,basedonbothbehaviorpatternandprotocolcharacteristics.Inaddition,theexperimentforvalidationisimplemented.SincethereexistsnomethodidentifyingMSNVoIPsessionandfurthermoretheIPaddresses,domainnames,portsandeventheprotocolsMSNPworksover,areallalterableduringtheapplication,whichmakesitdifficulttoidentifyMSNVoIPsession,thisworkwillbehelpfultoadvancetheresearchonVoIPidentification.
简介:摘要:地空通信是整个空管系统运行中最重要的环节,号称民航地面人员的‘顺风耳’,目前的空管语音通信系统基于模拟或数字混合技术,采用点对点线路,有限的通讯能力制约着空管运行效率和飞行安全,随着民航产业的发展,IP技术很有潜力来实现未来地空通信的功能需求和技术要求,通过该技术实现地空通信频率共享,能够节约本已经非常紧张的频率资源,提高地空通信设备使用频率,节约空管系统投资与运行成本,为此,空管部门多次组织了地空通信设备厂商进行了的互联互通性测试,本文浅析测试过程和测试结果,谈谈VoIP技术在空管的应用和展望。