| Within the trend of FMC (Fixed Mobile Convergence), VoIP (Voice over Internet Protocol) will absolutely become the most important service application in the all-IP network. SIP (Session Initialization Protocol), the most important application layer signaling protocol in FMC networks, will bring great revolution to VoIP calling technology. With the flatter networks and fuzzier terminals, SIP-based VoIP calling technology will bring great changes and benefits to users and network managers.This paper firstly analyzes the current situation and the development trend of SIP-based voice service applications, as well as main protocols and key technologies. On this basis, according to the features of FMC network, this paper designs group calling and real-time communication systems based on both terminal and Web modes. And a prototype system is implemented. This system can carry on group callings to SIP terminals according to the preestabilished parameters through group calling software SIP-Multicall and Web group calling page. And the system can also carry on real-time communications with arbitrary SIP terminals through run-time communication terminal Winphone and Web run-time communication page. Besides, this paper designs and implements a SIP signaling simulator to simulate mass combinated patterns SIP signalling. Simulated FMC network test environment is built. And by using various kinds of terminals and Web pages, VoIP group calling and run-time communication scenarios are simulated. The testing results prove that the system could adequately simulate and demonstrate various VoIP calling service modes in FMC networks. And the availability and practicability of the system have been proved. |
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