在电话交换系统的调试中，往往需要加入大话务量，以保证调试效果，因此大话务量模拟呼叫器对电话交换系统的调试是极有帮助的。文章分析了电话呼叫的进程，并介绍了模拟呼叫器完成呼叫的进程，最后提出了模拟呼叫器的实现方法。 In the telephone exchange system debugging, often need to add a large amount of traffic, in order to ensure the debugging effect, so the analog voice call service on the telephone exchange system debugging is very helpful. The article analyzes the process of telephone call, and introduces the process of simulating the pager to complete the call. Finally, the method of realizing the pager is proposed.