Design And Implementation Of The IMS Architecture Multi-Protocol Signaling Gateway

With the development of telecommunication technology,commercial telephone network has successively PSTN,ISDN and IMS.Following the same development path in professional communication field,IP communication network based on IMS architecture is being deployed at present.Since PSTN and dedicated ATM networks have been widely used in private networks,new IMS communication networks must support interconnection and intercommunication of voice services between heterogeneous networks.The IMS Architecture Multi-protocol Signaling Gateway Equipment can achieve voice service access of PSTN and dedicated ATM network,and realize interconnection and intercommunication with voice service of dedicated IMS network.This thesis compares and analyses the current technical architecture of IMS system and border gateway equipment at home and abroad,studies the session control protocols such as NO.7,ATM signaling protocol and SIP,analyses the functional requirements of gateway equipment in private communication network,and designs and implements the software framework of the IMS Architecture Multi-protocol Signaling Gateway Equipment.The multi-protocol bridge technology architecture is designed.In the field of private communication,many voice signaling protocols are used in different communication systems,which results in the difficulty and complexity of voice interoperability.Based on the analysis of various signaling protocols,various protocols are flexibly adapted by using internal signaling primitives as intermediate protocols,which reduces the complexity of signaling interoperability and improves the scalability of protocol interoperability.The hierarchical architecture of SIP protocol stack is designed.SIP stack software is divided into SIP protocol layer,SDP protocol layer and ABNF parsing layer.SIP protocol layer implements SIP protocol's headspace processing,call status management,transaction control,protocol parsing and assembly functions.SDP protocol realizes the parsing function of SDP protocol.ABNF parsing layer completes the lexical parsing function of the protocol.The design and coding of each software function are implemented.Among them,the maintenance management module realizes the maintenance and management function of the equipment;the number routing module realizes the protocol processing function with the directory server and the area code information management function;the signaling adaptation module completes the matching between different call signaling;the SIP protocol processing module realizes the SIP parsing function;the NO.7 signaling processing module realizes the NO.7 protocol parsing function;the special ATM signaling processing module realizes the functions of ATM signaling parsing and converting;and the interface adapting processing module realizes the function of ATM driving and adapting.The function and performance of voice service interworking between heterogeneous networks are tested.WINSIP software and ABACUS tester are used to test the concurrency ability and adaptation ability of the device.The results show that the functions and performance indicators meet the design requirements...