NGN网络测试仪H.248解码模块的设计与实现

Design and implementation of H.248 decoding module in NGN monitoring apparatus

NGN网络通过引入软交换技术实现了对于业务的控制和承载的分离,使网络融合成为可能;实际网络中普遍采用的H.248协议作为实现软交换的核心协议,因此要实现软交换并监测NGN核心网的运行情况,对H.248协议的解码就成为了要完成的最基本功能。本文介绍了H.248协议的基本概念及其在NGN网络中的作用接口,分析了它的协议连接模型和消息结构,并根据它的文本编码方式和二进制编码方式分别提出了解码的算法思想,设计了解码流程;最后通过对实际数据的分析,验证了设计实现的有效性和可靠性。

NGN Network accomplished the separation of controlling and bearing by introducing the soft-switching technique into the practical network.It made the integration of multiple networks possible.According to the situation that H.248 has been used as a coral protocol in practical network,the decoding of H.248 became a very necessary ability to accomplish Soft-Switching technique and monitoring the NGN Network.This paper introduces the conception,functions and its working interface,analyzes its protocol connecting model and message structure.Then,it separately brings up two decoding methods for H.248＇s character encoding form and binary encoding form.After implementing the module according to the decoding process which has been designed,it proves that the module is effective and reliable by testing with actuality dates.