The Design And Realization Of Multimedia Dispatcher Based On Softswitch

This research is about of the design and realization for dispatcher(Multimedia dispatcher)based on softswitc.With the evolution of PSTN to NGN,soft switch become to the core of the NGN network was gradually established.The core of this system platform is Acro?Switch soft switch,combined with electricity,rail transportation and other industries to achieve the practical application,developed to achieve a set of property rights of multimedia dispatcher.The system consists of soft switches,media dispatcher,media servers,recoder servers,phone and so on.The whole system runs on IP networks,a number of multimedia dispatcher can be combined into a dispatch group,dispatch group supports redundant configurations,the multimedia dispatcher in same group can be distributed on one soft switch,can also be distributed in more than one soft switch.Multimedia dispatcher support to call other terminal of the same system,and also support to call other terminals in defferent systems.First,the article describes the project background of dispatch multimedia,including NGN networks,softswitch that the core of NGN network and softswitch,and technical features,functions and protocols of softswitch.Introduces real-time transmission of multimedia and codec technology for audio and video.Second,research the specific design for multimedia dispatcher subsystem of soft switching system.According to the specific needs of multimedia dispatcher and functional requirements,proposed design ideas of multimedia dispatcher,discussed in detail the structure and modules division of dispatcher,external interfaces,internal interfaces,system startup and initialization,call control,real-time transmission of audio coddec,video codec,recording,operator interfaces etc.And gives a process of typical call for multimedia dispatcher,including dual handle support,outgoing call,incoming call,hold,group call service,transfer service,pre-meetings.Finally,the paper gives the development and the specific implementation technologies of multimedia dispatcher,including hardware and software environment,loading mode,the typical message processing and communications and the corresponding typical data structures.And the verification was passed for system design,through a variety of testing methods and a number of test cases verify the stability of the system,and prove that the system meets the design requirements.The system is reliable,flexible configuration,feature-rich,relying on a strong solution of soft switches,multimedia dispatcher can be applied to different areas and different occasions,it has become the company’s new products into production.