TilmannBach/sipsorcery-fork
This is a fork of the sipsorcery project by aaronc originally hosted on codeplex. It's released under the "New BSD License (BSD)". https://sipsorcery.codeplex.com/ It is the best and most complete free SIP-Stack written in C#. I did a lot of changes for getting this stack working with an IMS (IP Multimedia Subsystem) network.