RTP developement in .net

[C# Programming]

I am looking for Open Source Library for RTP developement in .net.

I need to know about RTCP in RTP project:

1. How can i make RTCP packet?
2. RTCP automatically control the session rate mean quality for audio/video call?

How can possible to sycronize the audio and video in call?

Please send me link or sample code if anybody have.



Thanks in advance
Saurabh