短消息中心主要包括：短消息协议处理模块、七号信令模块和内存数据库模块。

The Short Message Center mainly includes: SM protocol module, Forward signal module, main memory database module, SMPP module and so on.

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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.

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ASON的基本功能模块包括三个部分：路由、信令和链路管理。

According to its functions, ASON is departed into three basic modules: routing, signaling and link management.

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