IMS接入网关智能路由

在数字电话交换系统中设计IMS接入网关以解决目前将语音应用接入到CM-IMS网络中等问题，其中设计接入网关的智能路由支持在IP或TDM中继故障后自动重选，根据实际需求配置中继选路的策略以达到局间通信的可靠性和费用最低的要求。介绍了IMS接入网关的应用及研究现状，阐述Asterisk的具体情况，描述了IMS接入网关智能路由的功能，并给出智能路由的详细设计，路由的属性及数据结构的定义，最后结合 Asterisk 开源项目，实现了智能路由的功能，通过实验成功验证了智能路由按费率、优先级、轮转策略选择中继及号码变换的功能，达到了通信的可靠性及低费用的要求。

IMS Access Gateway Intelligent Routing

In the digital telephone switching system, designing an IMS access gateway is to solve the applications of voice access to the CM-IMS network. When IP or the TDM relay failed, the IMS access gateway intelligent routing can reconnect automatically. According to the actual configuration, the routing strategy can meet the reliability of communication and lowest cost. This paper introduces the application and research of IMS access gateway and expounds the situation of Asterisk. It describes the function of IMS access gateway intelligent routing and analyzes the design in detail, including the attributes of the routing and the definition of data structure. Finally, I realize the function of intelligent routing in combination with the Asterisk open source project. Choosing relay and number transform are verified by experiments. And the intelligent routing has reached the requirement of reliability and low cost.