联通短信网关协议，短信网关ISMG全称Internet Short Message Gateway，主要是为了解决各网络、各运营商之间的短信互通和SP的接入问题。它为应用单位收发短信而提供的一个动态数据交换平台系统。-Unicom SMS Gateway Protocol ISMG full name of the Internet Short Message Gateway, SMS Gateway In order to solve various network SMS interworking between operators and SP access. A dynamic data exchange platform for the application unit to send and receive SMS system.