说明：  sipsak是一个命令行工具，用于在Session Initiation Protocol (SIP)应用程序和设备上执行多种测试。它能做四种不同的测试，发送文件内容，并解释和作用于响应。
(sipsak is orders the good tool, uses in (SIP) on the application procedure and the equipment carries out the many kinds of tests in Session Initiation Protocol. It can make four kind of different tests, the transmission document content, and explanation and function to response. )