title: C# SIP Stack/Library
body: <p>I am looking for a good SIP library either written in C# or that provides a C# wrapper.  Does not necessarily need to be free.  Has anyone used anything good?</p>
  
  <p>To clarify, I am talking about the VoIP protocol SIP.</p>
  
  <p>I am really looking for more than a google search on this one.  I would like to someone to come back and say "We use ______, and it works great."</p>
  
  <p>To clarify further, I am looking for a library that would help me to implement a SIP proxy server without having to manually construct the SIP packets.  I'm not looking for asterisk, freeswitch or any other pbx software. </p>
  
  <p>I am looking to create a service in C#, that will wait for SIP packets and respond to them and I would like a library that would handle most of the details.</p>