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IMS (IPMultimediaSubsystem) that the proposed IP multimedia subsystem, the R5 version based on the 3GPP standards organization, common network architecture to provide multimedia services on IP-based networks, is also 3GPP/3GPP2 (mobile) and TISPAN / ITU-T (fixed the core of the) network architecture. R5 version of the definition of the main structure of IMS core network element functions, interfaces, and processes; R6 version of IMS perfect IMS service features, interoperability of IMS and other networks, norms and WLAN access features; R7 strengthening of fixed standardization mobile convergence, IMS supports xDSL, cable and fixed access. NGN technology, compared to the previous IMS technology further decomposition of the function of the control layer, session control entity CSCF (CallSessionControlFunction) and bearer control entity MGCF (Media Gateway Control Function) on the function of the separation, the more open network architecture and flexible. IMS for its business, control, carries a complete separation of the level structure, centralized user attributes and access-independent features, for the settlement of softswitch technology can not solve the problem, such as user mobility support, open standard interfaces of business flexible IP multimedia services, etc.; on the other hand, the access independent, also allows IMS to become the basis of the evolution of fixed and mobile networks. In short, IMS is an open system architecture, both the PS network of mobile operators and fixed operators in the CS network, using a variety of wireless and wired access technology to provide the most extensive IP-based services. Are to telecom operators in the transformation of the entire business operations, IMS can build cost-effective network, the network can not access restrictions, and the integration of voice and data. This fusion for the realization of the Internet, fixed-line, mobile network triple play IP network vision has taken an important first step. IMS, telecom operators can get in with a network's ability to provide a variety of business, and these businesses can be integrated as a new business model, through the mobile network or the fixed network transmission. Therefore, the construction of the IMS network has become the the operators increasingly urgent task. Given the importance of the IMS network, the Research Institute of China Telecom Group company in Guangdong Province deployed IMS experimental network test equipment from different vendors, and its main purpose is to further study the IMS network technology, including networking solutions, technology maturity, to support various types of the ability of the business, manufacturers compatibility testing. This paper demonstrates the experimental network which architecture and networking in the form to complete the testing of the traditional telecom services and a variety of new business: voice (fixed and mobile), data, fax, video, SIP, EPON , RADIUS, DIAMETER business, and IMS the experimental network formation process.
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