SIP .NET

There was a question about SIP and .NET. I found some items on the web which might be useful to the student who asked this and maybe to some others as well:

• Some discussion on SIP and C#
  
• Windows call manager and outlook dialer
  
• Also, as far as Asterisk goes, there were some links on this page.
  

I am sure that some other hits would be found on at least one of the following links:

• Vovida
  
• Voip-Info.org
  
• GNU VoIP Free Software Directory
  

I hope at least some of that helps. As far as COM Interop goes, there is an interesting article at Code Project, or at MSDN. For C Library interop with .NET, see this page.
Happy SIPping!