U-SYS SoftX3000 软交换系统技术手册信令与协议分册目录 i 目录第4章 协议.................................................................................................................................. 4-1 概述.................................................................................................................................................. 4-1 基本概念............................................................................................................................... 4-1 相关术语............................................................................................................................... 4-1 协议栈结构........................................................................................................................... 4-4 协议的应用............................................................................................................... 4-5 RAS 协议......................................................................................................................................... 4-7 概述....................................................................................................................................... 4-7 协议消息............................................................................................................................... 4-7 基本消息流程..................................................................................................................... 4-15 呼叫信令协议................................................................................................................. 4-17 概述..................................................................................................................................... 4-17 协议消息............................................................................................................................. 4-17 基本消息流程.......................................................................................
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