Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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END OF TERMS AND CONDITIONS
应用整体采用了多模块设计的方式，用于处理通话应用的业务逻辑与数据管理以及界面显示，每个模块都遵循上述架构的划分原则。
各模块的作用分别如下：
