The system adopts multi-threading technology, which can simultaneously support multiple network phone platforms. The pursuit number can be set to "arbitrary number display", and is not easily intercepted by the other party's call "firewall". The functions increased in the Network Phone Auto Callback System (Call-Dead-You System) V4.0.0.0 are as follows: (1) Increase the automatic identification of connection status of He Yue, Ali Tong, and UU Call network phones....