How to do Audio/Vedio streaming between web cams and back end servers?

I want to implement an internet chat application, I mean, I want a front end, which connects a web cam (mic and speaker). So, I can send videos and audios to a back end server (do flash streaming? but I am not sure what good product out there I can use), and also send both A/V to another computer on the internet. In other words, need a front end that sends local a/v from webcam (&mic) to backend and receives remote a/v from backend to webcam (and speaker) + backend streaming server.
Any suggestions of techniques to be used? What back end flash streaming server should I sue? How to acquire A/V from web cam (& mic) and how to send A/V to web cam (&speaker) to play?
Thanks a lot!

Front end development:- You can use Flash CS4/CS5 or Flex Builder.
Back-end Programming - Server-side programming is basically done using ActionScript. You can use Flash CS4 , but there is no need for special authoring tool, you can do with even text-editor. After you author, you just need to place files at proper location on FMS.
Front-end runtime - You just need Flash Player installed , basically active-x or plug-in in your browser - which you would already have by now
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How to do Audio/Vedio streaming between web cams and back end servers?

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