The Design And Imlementation Of Voice Browser Based On Sip

In order to overcome shortcomings such as single means of access to message and the small amount of information in traditional voice application, a Voice Browser has been designed and developed in SIP protocol, based on the anslysis of VoiceXML technology and SIP protocol. Voice Browser supports user access the Internet with voice pronunciation way. The connection between PSTN (Public Switched Telephone Network) and Internet is implemented.Firstly, the development of voice browse technology, VoIP, SIP protocol and VoiceXML technology are introduced. The hierarchical model of Voice Browser is given, and then the whole system is deivided according to functional modules. Voice Browser deploys the various functional modules distributed and designs the Distributed Speech Platform Communication protocol for communicating to the speech execution platform. Secondly, the SIP protocol and codes of open-source projects Opal and Ptlib class are analyzed in-depth. The speech execution platform based on SIP protocol, using message callback event handing mechanism which similars to the Windows, is designed and implemented.Thirdly, on the basis of open-source projects OpenVXI and VoiceXML technology, the interpreter and flow controller to VoiceXML document are finished. By applying the voice technology provider IFly pronunciation product, the ASR and TTS are implemented. Finally, the system has been tested, and the result is analyzed and summarized.This Voice Browser system supports client to use the telephone to access interent information through dialogue.This system supports both voice-card accesses, also the digital coded form of the virtual channel access to. Using the VoiceXML markup language designed not only to documents prepared by simple procedures, norms and convenience, but also the introduction of voice-interactive data browsing the Internet world, makes the system more natural, simple and rich.