基于jslee的多媒体会议sip信令控制层的设计和实现

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1、≤』广，I-；北京邮电大学硕士学位论文ABSTRACTTHEDESIGNANDIMPLEMENTATIoNoFTHESIPCONTROLLAYERINMULTIMEDIACoNFERENCEBASEDoNJAIN．SLEEABSTRACTInthispaper,theauthordescribedageneralmethodofdesigningthelevelofSIPsignalcontrolling．andtheimplementationusingmobicentsbasedonJSLEE．Th

2、erearethreepansofthislevel．includingmodifyingandencapsulatingtheSIPstackandencodingtheresourceadapterandimplementingofSIPcontrollinglogic．Besides．therelatedplatforlnandthebasicrelationshipandmethodsofcommunicationsamongpartsitarealsointroduced．TheSIPstac

3、kdecodestheSIPmessagetexttogetvaluesofeachhead．fieldanditsbodyandencodesthehead．fieldsintothetext．too．Besides，itmanagestheSIPtransactions．ThebottomlevelistotransamitthemessagesonTCP／IPUDPiSusuallychosensinceSIPprotocolhasalreadyincludesmechanismsofhand．s

4、hakingandtime．out．TheSIPstackusuallyneedstobeencapsulatedtoauniformlevelwiththesameinterfaces．TheresourceadapteriSanencapsulationofSIPstackinordertoconnectintothemobicens．whichtransformtheSIPmessagestoRAevents．TherearetwomainmethodsoftheSIPsignalcontroll

5、inglogic．OneprovidesinterfacestotheservicewithclearsemANTic．shieldingthecomplexityofSIPinteractionamongmulitiUA．Theothertriggersthebusinesslogicautomaticallybytheinitialevent．routingandcontrollingtheSIPconnection．BytheinsidemodulesofJSLEE，theSIPmessagesa

6、ndservicescommunicatesthroughasynchronousmessages．Onecallmeansonesbb—tree，andinvokinginsideofitissynchronous．Sbb．tressaremanyindependentthreads，andsavingprivatedatabyeachoneitself．Theprincipleofdesigningincludesholdingdatadynamicllybyeachdialog．andallobj

7、ectsofoperationsaresingletonssharedbyalldialogs．Inthispaper,IalsointroducedinshortatoolofcreatingSIPmessagecontr01．whichcanaddandmodifythelogicofSIPsignalsandcreatingJ斟ksourcecode．Oryoucansavethemasfiles．KEYWORDSSIP,signalcontrolling，JSLEE，mobicentsIl■、《

8、：II耳0。．．，北京邮电大学硕士学位论文．目录第一章1．11．2第二章2．1第三章3．13．2第四章4．1目录绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．1背景介绍⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯l1．1．1项目背景⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．1论文结构⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯2相关技术简介⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯