I want to develop net meeting software

I am using Microsoft based technologies, Silverlight, ASP.NET, SQL Server and IIS. I want to develop net meeting software, which is web based or client software based. Multiple parties could join the meeting, see each other (using cameras) and hear the voice from each party. Better to have ability to record the meeting.

Are there any open so开发者_运维技巧urce of existing SDK for me to quick start with the development?

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There is webcam and microphone support in silverlight 4.
But there is no builtin support for livestreaming. So there is one big problem: how to stream video from one client to others?
If you are streaming from server, you can use Smooth Streaming. But as you are planning to make meeting application this is not acceptible for you.
Video Chat between two users is simple application form silverlight community.
Here are some similar discussions that can be usefull:

• Live Video Chat - [SilverLight on browser , Encoder x264 , IIS Smooth Streaming, ?? ]
• How to create video chat---Silverlight 4