The Design And Realization Of Softswitch Center Of Dedicated Network Based On TD-SCDMA

With the development of communication technology, soft switching technology will become mainstream in the future. Currently, ISUP signaling has begun to replace the traditional TUP signaling. Compared with traditional H.323standard, SIP standard has been widely recognized because of its simplicity and freedom. However, MAP protocol has already been extensively used in many core network interfaces.Based on several common soft switching protocols such as SIP protocol, ISUP protocol and MAP protocol, the paper designed application software of a3G core network switching equipment supporting these three protocols. The paper also described the functions of the software in detail, especially the design and development of ISUP-SIP session function, SIP-SIP session function, short message and USSD service functions. Besides, several field test cases were designed corresponding to the functions implemented, and the functions mentioned above were also verified. Finally, by analyzing the phenomenon and packets of the testing process, the paper proved that the equipment could provide excellent support for ISUP-SIP/SIP-SIP conversation function, SMS function and USSD services.