同时对软交换、用户数据中心设置方案，中继网关、信令网关建设方案，计费采集系统建设方案等进行了设计。
The construction solution for Softswitch and subscriber data center, relay gateway and signaling gateway, as well as billing system are also given.
信令和用户数据都应被加密。
文档对数据传输协议和相关的通过S1接口建立用户平面传输承载的信令协议进行了详细的说明。
The present document specifies the standards for user data transport protocols and related signalling protocols to establish user plane transport bearers over the S1 interface.
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