基于SIP协议的IP电话研究与实现

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1、西南交通大学硕士学位论文基于SIP协议的IP电话研究与实现姓名：高伟申请学位级别：硕士专业：系统工程指导教师：金炜东20070401西南交通大学硕士研究生学位论文第1I页AbstractWiththerapiddevelopmentofinteractanddigitalcommunicationtechnology,intemethasmoreandmoreinfluenceonpeople’Slife，meanwhilestimulatesthefastdevelopmentofallkindsofappliedtechnology．Her

2、einIPcommunicationtechnologyisatypicalexample．VolP(SOcalledIPtelephone)communicationcontrollingsystemmainlycanbedescribedasH．323forITU-TandSIPforIETF．SIPisthecontrollingprotocolintheappliedlevelandrunintheIPnetworktoprocessmultimediacommunication．ComparingwithH．323，SIPprotoc

3、olhastheadvantages，suchassimpleandflexiblestructure，easytoextendandsuitableforinternetconnect，etc．Itisadaptivetopopularizeandapplyinlarge-scale．BasedontheresearchofVoIPtechnologythisthesisbringsforwardtheprojectofVoIPterminalforSIP,moreoverdesignandimplementtheIPtelephoneter

4、minalbased0nSIP．FirstlythisthesisresearchestherelatedtechnologyofVoIPbasedondiscussingthecurrentstatusanddevelopmenttrendofIPtelephone，andthenanalysisthesystemstmctureofSIPprotocolandtheopenprotocolstackOSIP．Secondly,thisthesisbringsoutthesystemprojectasawhole．Itisdesignedby

5、moduleprojcotandbasedontherequirementofIPtelephoneterminal．Thereisfourmodulesforthesystem，maincontrollingmodule，SIPmodule，interacttransfermoduleandmediatransactmoduleforaudio&videomodule．ThedesignforSIPmoduleisbasedonOSIPprotocolstack,implementsSIPfunctionthroughthedesignofU

6、Aframeaboveprotocolstack．InternettransfermoduleadoptsUDPtransfermodetoimplementthetransferofSIPmessageandmultimediadata．MediatransactmoduleadoptsG．729AandH．263asthecompressprojeetsofaudioandvideo．ThethesisresearchstheprincipleandstructureofSIPserver,andalsodesignsaSIPserverw

7、ithregisterandproxyfunction．ThethesistestsandanalysisesforthesystemafterdesignontheIPtelephoneterminal．TheresultshowstheSIPtelephonetermialrunsstably,and西南交通大学硕士研究生学位论文第l

8、I页achievestherequirementsforallfunctionsinthedesign．Finally,thisarticlesunl$upthemainpointsofresearchand

9、raisesthefuturework．KeyWords：VolP；SIP；H．323；VideoPhone；UserAgent；SIPServer西