语音对讲呼叫机,被叫端，被动接收呼叫为呼叫端，主动发起呼叫。网上修改整理优化，完全编译，已经正式使用，经过严格测试. -Voice intercom call machine, called side, passive receiving calls to the call side, to initiate the call. Online modification order optimization, complete compilation, has been officially us