说明：  GSM通信流程包括两方面的内容呼叫基本流程信令基本流程其中呼叫 流程主要包含移动主叫流程移动被叫流程汇接呼叫流程信令基本流程 主要包含鉴权流程位置登记流程呼叫重建流程BSC内部切换流程 BSC间切换流程MSC间切换流程移动始发短消息流程移动终结短消息流 程定向重试流程
(GSM communication flow comprises two aspects of the basic call flow signaling call flow in which the basic flow the main flow containing mobile caller called mobile call flow signaling flow aggregation mainly includes authentication basic flow flow flow position registration call flow BSC internal reconstruction BSC switch to switch between flow flow flow MSC switch between mobile发短消息before the end of short message mobile flow flow flow directed retry)