What business does the international spread of short messages refer to?

International short message intercommunication service refers to the service of sending and receiving short messages between China telecom users and operators outside Chinese mainland and China (including operators in Hong Kong, Macao and Taiwan). The international communication of short messages was officially opened on May 7, 2004/kloc-0, realizing the international communication of short messages with more than 100 countries and regions. At present, it is realized by means of third-party transfer.