实现ftp的上传、下载、删除、创建目录、删除目录、移动等功能并且可以断点续传和多线程上传下载-Achieve ftp upload, download, delete, create directories, delete directories, move and other functions and can be multi-threaded HTTP, and uploading and downloading

SIP协议栈，非常少的c#版的，类似c++的pjsip是开源的，同时兼容了底层的stun，upnp，mail，ftp等协议栈-sip stack in c# version ,it is like pjsip ,it is open source in c#,including sip mail stun upnp nat and so on