Considering the signaling system project for Beijing subway Line 4 and its extension, two different implementation options are discussed.
针对北京地铁4号线及其延伸，讨论线路延伸工程中信号系统适用的两种实施方案。
In the application design part, we design the system into four modules and analyze the design process of its two major modules, SIP signaling module and gateway control module.
应用软件设计部分，我们将系统设计为四大模块，论文详细分析了其两大重要模块网关控制模块和SIP信令模块的设计过程。
In the application design part, we design the system into four modules and analyze the design process of its two major modules, SIP signaling module and gateway control module.
应用软件设计部分，我们将系统设计为四大模块，论文详细分析了其两大重要模块网关控制模块和SIP信令模块的设计过程。
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